G A S F U R N A C E S
G43UF
MERIT® SERIES
Up−Flow
E N G I N E E R I N G D A T A
Bulletin No. 210394
August 2005
Supersedes December 2004
AFUE − up to 92.1%
Input − 44,000 to 132,000 Btuh
Nominal Add−on Cooling − 2 to 5 Tons
MODEL NUMBER IDENTIFICATION
G 43 UF − 24B − 045
Unit Type
G = Gas Furnace
Nominal Gas Heat Input
Series
43 = 90% Minimum AFUE
045 = 44,000 Btuh (12.9 kW)
070 = 66,000 Btuh (19.3 kW)
090 = 88,000 Btuh (25.8 kW)
110 = 110,000 Btuh (32.2 kW)
135 = 132,000 Btuh (38.7 kW)
Configuration
UF = Up−Flow
1
Cabinet Width
Nominal Add−On Cooling Capacity
24 = 2 tons (7.0 kW)
36 = 3 tons (10.5 kW)
B = 17−1/2 in. (445 mm)
C = 21 in. (533 mm)
D = 24−1/2 in. (622 mm)
48 = 4 tons (14.10 kW)
60 = 5 tons (17.5 kW)
1
Indoor coils with the same letter designation
will physically match the furnace.
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FEATURES
OPTIONS
B HEATING SYSTEM
Lennox Duralok Plus Heat Exchanger Assembly
®
High Altitude Orifice Kit − Natural Gas Only
Required for all natural gas models for proper unit operation at
altitudes of 7501 to 10,000 feet (2286 to 3048 m).
Proper orifice for LPG/Propane models is included with
LPG/Propane Conversion Kit.
Lennox developed heat exchanger assembly consists of primary
heat exchanger and secondary condenser coil assembly.
Main 3-pass clamshell type heat exchanger constructed of
heavy−gauge, aluminized steel.
Designed for normal expansion and contraction.
Crimped seam design and construction provides maximum
efficiency and minimum resistance to airflow.
High Altitude Pressure Switch Kit
Required on certain units for proper unit operation on
installations above 4,500 ft. (1372 m).
Secondary heat exchanger condenser coil constructed of
aluminum fins fitted to stainless steel tubes.
Coil is factory tested for leaks.
C
LPG/Propane Conversion Kit
Required for field changeover from natural gas to LPG/Propane.
Condensate drain header box assembly located on front of coil.
Compact size of complete heat exchanger assembly permits low
overall design of furnace cabinet.
All components mounted in a heavy−gauge steel frame.
Heat exchanger assembly has been laboratory life cycle tested.
Lennox Designed Header Box
Header box on end of condenser coil collects flue condensate for
disposal through condensate collars.
Hose connects the header box drains to the condensate collars.
The condensate collars are located on each side of the cabinet
for easy field installation of condensate drain trap. Only one
collar is used, the other is plugged.
Condensate drain trap is included with the unit for field installation.
Lennox Designed Flue Condensate Trap Assembly
Condensate trap assembly is mounted outside the conditioned
air stream.
Assembly can be mounted on either side of cabinet. See
Installation Instructions.
CONTROLS
H Integrated Furnace Control Board
Solid−state board contains all necessary controls and relays to
operate furnace.
Combustion air inducer is controlled by board. Prior to ignition, a
pre−purge cycle for 15 seconds is initiated. After the main
burners are turned off, a post−purge cycle for 5 seconds is run.
Ignition control board continuously monitors line voltage and
maintains the igniter power at a constant level to provide
consistent lighting and maximum igniter life.
Electronic flame sensor control assures safe and reliable operation.
Should loss of flame occur, flame sensor controls will initiate 4
attempts at re−ignition before locking out unit operation for 60
minutes.
Watchguard type circuit automatically resets ignition controls
after one hour of continuous thermostat demand after unit
lockout, eliminating nuisance calls for service.
Fan control consists of adjustable blower timed−off delay (60, 90,
120, 180 seconds − factory setting 90 seconds) and fixed blower
timed−on delay (45 seconds).
Connection can be made with field provided 1/2 in. PVC pipe, 3/4 in.
PVC coupling, or 1−1/4 in. OD x 1 in. ID vinyl tubing with hose clamp.
Easy to clean and winterize.
For air−conditioning applications, blower is automatically
energized on thermostat demand for cooling.
Two accessory terminals furnished for additional power supply
requirements for 120 volt (less than 1 amp) power humidifiers and
powered air cleaners.
D Inshot Burners
Aluminized steel inshot burners provide efficient, trouble−free
operation.
I
Burner venturi mixes air and gas in correct proportion for proper
combustion.
Burner assembly is removable from the unit as a single
component for ease of service.
Hot Surface Mini−Nitride Ignitor
Ignition control has two LED’s to indicate status and as an aid in
troubleshooting.
J 24 Volt Transformer
Furnished and factory installed in control box.
40VA transformer has fuse wired in series.
Unique, non−porous, high strength proprietary ceramic material
provides long life and trouble−free maintenance.
Low mass element provides fast heat−up and consistent igniter
temperature with low power usage.
Cemented to alumina block for positive mounting and protection
against current leakage.
K Field Wiring Make-up Box
Furnished for line voltage wiring.
Factory installed internally on left side of furnace.
Box may be installed internally or externally on either side of
furnace.
®
High temperature Teflon insulated ignition lead wires for
dependable operation.
OPTIONS
E Gas Control Valve
24 volt redundant combination gas control valve combines
manual shut off valve (On−Off), automatic electric valve (dual)
and gas pressure regulation into a compact combination control.
Thermostat
See Thermostat bulletins in Controls section and Lennox Price
Book for a complete list of thermostats.
F Combustion Air Inducer
Twinning Kit
Shaded pole heavy−duty blower prepurges heat exchanger and
safely vents flue products.
Required to operate two furnaces simultaneously.
Kit consists of twinning control and two fan sensors.
Pressure switch proves blower operation before allowing gas
valve to open.
G
BLOWER
Operates only during heating cycle.
Limit Control
Automatic reset, primary limit is accurately located.
Factory installed on vestibule panel on all units.
Flame Rollout Switch
Multi-speed, direct drive blower.
Statically and dynamically balanced.
Resiliently mounted.
L
Blower assembly slides out of unit for servicing.
Blower speeds are easily changed on the integrated furnace
control board. See blower performance tables.
M
Manual reset switches are factory installed on burner box.
Switch provides protection from abnormal operating conditions.
G43UF / Page 3
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FEATURES
OPTIONS
FILTER (NOT FURNISHED)
Filter and provisions for external mounting must be field
provided.
Condensate Drain Heat Cable Kits
Self-limiting wattage heat cable prevents condensate drain from
freezing in unconditioned areas.
OPTIONS
Available in 6, 24 or 50 ft. (1.8, 7.3, or 15.2 m) lengths.
Heat Cable Tape:
66 ft. (20 m) length, 1/2 in. (13 mm) wide fiberglass.
60 ft. (18 m) length, 2 in. (51 mm) wide aluminum foil.
Air Filter and Rack Kit for Side Return Air Applications
(Not for use with RAB Return Air Base)
Washable or vacuum cleanable polyurethane frame type filter
and external side return air rack available for field installation.
Available in single and ten pack kits.
Rack has filter door for easy filter servicing.
Flanges on rack allow easy duct connection.
Field installs on either side of unit cabinet.
See dimension drawing.
Condensate Trap Alternate Location Kit
Allows condensate drain to be installed on the opposite side of
the furnace from the exhaust venting (up−flow applications only).
RAB Return Air Base
On furnaces with side return air and condensate trap on the
same side of the cabinet, a field fabricated transition or RAB is
required when installing an IAQ product higher than 14−3/16 in.
(360 mm) when installed next to the unit and serviced from the
front. IAQ products higher than 20 in. (508 mm) require a field
fabricated transition.
Must be used for 60C and 60D models with air volumes over
1800 cfm (850 L/s) in up−flow applications when only one side
return is required.
EZ Filter Base for Bottom Return Air Applications
Hinged door with thumbscrew for easy filter access.
Uses standard size filters (field provided).
CABINET
Low−profile, narrow width cabinet allows easy installation.
Heavy−gauge, cold rolled steel construction.
Pre−painted cabinet finish.
Flanges provided on supply air opening for ease of plenum
connection or alignment with indoor coil.
Cabinet is insulated with foil faced insulation on sides and back
of heating compartment.
Complete service access.
Cabinet is pre−painted steel to match the furnace.
See Dimension Drawing.
N
O
Safety interlock switch automatically shuts off power to unit
when blower compartment access door is removed.
Gas piping and electrical inlets are provided in both sides of cabinet.
Return Air Entry:
P
For bottom return−air entry, remove furnished bottom seal panel
from cabinet.
For side return−air entry, corners are marked on either side of
cabinet for return air cut−outs. On furnaces with side return air
and condensate trap on the same side of the cabinet, a field
fabricated transition or RAB is required to use an IAQ product
higher than 14−3/16 in. (360 mm) when installed next to the unit
and serviced from the front. IAQ products higher than 20 in. (508
mm) require a field fabricated transition. See dimension
drawings.
NOTE − 60C and 60D size units that require air volumes over
1800 cfm (850 L/s) must have one of the following:
1. Single side return air with transition, to accommodate 20 x
25 x 1 in. (508 x 635 x 25 mm) cleanable air filter, required to
maintain proper air velocity.
2. Single side return air with optional RAB Return Air Base.
3. Bottom return air.
4. Return air from both sides.
5. Bottom and one side return air.
See Blower Performance Tables for additional information.
Coil Match−up
All furnaces exactly match C33 and CX34 cased up−flow indoor
coils with same letter designation in model number. No adaptor
required. Engaging holes furnished on cabinet for alignment.
C33 uncased coils match furnaces without any overhang but
require an optional adaptor base or field fabricated transition to
match furnace opening. See C33 coil bulletin for additional
information.
G43UF / Page 4
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SPECIFICATIONS
Gas
Heating
Performance
ModelꢀNo.
G43UF
−24B−045
G43UF
−24B−070
G43UF
−36B−070
G43UF
−36C−090
G43UF
−36C−090H
Canada Only
Inputꢀ− Btuh (kW) 44,000 (12.9) 66,000 (19.3) 66,000 (19.3) 88,000 (25.8) 88,000 (25.8)
Outputꢀ− Btuh (kW) 40,300 (11.8) 61,000 (17.9) 62,000 (18.2) 82,000 (24.0) 81,000 (23.7)
Temperature rise range − _ F (_ C)
30 − 60
(18 − 36)
50 − 80
(28 − 44)
40 − 70
(22 − 39)
40 − 70
(22 − 39)
50 − 80
(28 − 44)
1
AFUE
92.1%
.50 (124)
2 / 2
90.0%
.50 (124)
2 / 2
92.1%
.50 (124)
2 / 2
92.1%
.50 (124)
2 / 2
90.0%
.50 (124)
2 / 2
Highꢀstaticꢀ(CSA)ꢀ− in.ꢀw.g. (Pa)
Intake / Exhaust Pipe (PVC)
Connections
in.
Condensate Drain Trap (PVC pipe) − i.d.
with field supplied (PVC coupling) − o.d.
hose with hose clamp − i.d. x o.d.
GasꢀpipeꢀsizeꢀIPSꢀ
1/2
1/2
1/2
1/2
1/2
3/4
3/4
3/4
3/4
3/4
1−1/4 x 1
1/2
1−1/4 x 1
1/2
1−1/4 x 1
1/2
1−1/4 x 1
1/2
1−1/4 x 1
1/2
Indoor
Blower
Wheel nominal diameter x width −ꢀin. 10 x 7
(mm) (254 x 178)
10 x 7
(254 x 178)
10 x 8
(254 x 203)
10 x 8
(254 x 203)
10 x 8
(254 x 203)
Motorꢀoutput − hp (W)
Tonsꢀ(kW) ofꢀadd−onꢀcooling
1/5 (149)
1/5 (149)
1/3 (249)
1/3 (249)
1/3 (249)
1.5 − 2
(5.3 − 7.0)
1.5 − 2
(5.3 − 7.0)
2 − 3
(8.8 − 10.5)
2 − 3
(7.0 − 10.5)
2 − 3
(7.0 − 10.5)
Air Volume Range − cfm (L/s) 465 − 1125
(220 − 530)
425 − 1020
(200 − 480)
710 − 1640
(335 − 775)
730 − 1630
(345 − 770)
730 − 1630
(345 − 770)
ShippingꢀData − lbs. (kg) − 1 package
132 (60)
141 (64)
146 (66)
162 (74)
162 (74)
Electricalꢀcharacteristics
120 volts − 60 hertz − 1 phase (less than 12 amps)
SPECIFICATIONS
Gas
Heating
Performance
ModelꢀNo.
G43UF
−48C−090
G43UF
−48C−110
G43UF
−48C−110H
Canada Only
G43UF
−60C−110
G43UF
−60D−135
Inputꢀ− Btuh (kW) 88,000 (25.8) 110,000 (32.2) 110,000 (32.2) 110,000 (32.2) 132,000 (38.7)
Outputꢀ− Btuh (kW) 82,000 (24.0) 103,000 (30.2) 101,000 (29.6) 103,000 (30.2) 123,000 (36.0)
Temperature rise range − _ F (_ C)
40 − 70
(22 − 39)
45 − 75
(27 − 45)
50 − 80
(28 − 44)
40 − 70
(22 − 39)
45 − 75
(27 − 45)
1
AFUE
92.1%
.50 (124)
2 / 2
92.1%
.50 (124)
2 / 2
90.0%
.50 (124)
2 / 2
92.1%
.50 (124)
2 / 2
92.1%
.50 (124)
3 / 3
Highꢀstaticꢀ(CSA)ꢀ− in.ꢀw.g. (Pa)
Intake / Exhaust Pipe (PVC)
Connections
in.
Condensate Drain Trap (PVC pipe) − i.d.
with field supplied (PVC coupling) − o.d.
hose with hose clamp − i.d. x o.d.
GasꢀpipeꢀsizeꢀIPS
1/2
1/2
1/2
1/2
1/2
3/4
3/4
3/4
3/4
3/4
1−1/4 x 1
1/2
1−1/4 x 1
1/2
1−1/4 x 1
1/2
1−1/4 x 1
1/2
1−1/4 x 1
1/2
Indoor
Blower
Wheelꢀnominalꢀdiameter ꢀxꢀwidth −ꢀin. 10 x 10
(mm) (254 x 254)
10 x 10
(254 x 254)
10 x 10
(254 x 254)
11−1/2 x 10
(292 x 229)
11−1/2 x 10
(292 x 229)
Motorꢀoutput − hp (W)
Tonsꢀ(kW) ofꢀadd−onꢀcooling
1/2 (373)
3 − 4
1/2 (373)
3 − 4
1/2 (373)
3 − 4
1 (746)
4 − 5
1 (746)
4 − 5
(10.5 − 14.0) (10.5 − 14.0) (10.5 − 14.0) (14.0 − 17.5) (14.0 − 17.5)
Air Volume Range − cfm (L/s) 950 − 2180 885 − 2160 885 − 2160 1470 − 2720 1440 − 2730
(450 − 1030) (420 − 1020) (420 − 1020) (695 − 1285) (680 − 1290)
168 (76) 178 (81) 178 (81) 186 (84) 203 (92)
120 volts − 60 hertz − 1 phase (less than 12 amps)
ShippingꢀData − lbs. (kg) − 1 package
Electricalꢀcharacteristics
NOTE − Filters and provisions for mounting are not furnished and must be field provided.
1
Annual Fuel Utilization Efficiency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non−weatherized furnaces
G43UF / Page 5
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OPTIONAL ACCESSORIES − MUST BE ORDERED EXTRA
ꢁB" Width Models
ꢁC" Width Models
ꢁD" Width Models
FILTER KITS
1
Air Filter and
Rack Kit
Horizontal (end)
Side Return
Size of filter − in. 87L96 − 18 x 25 x 1
(mm)
87L97 − 20 x 25 x 1
(508 x 635 x 25)
87L98 − 25 x 25 x 1
(635 x 635 x 25)
(457 x 635 x 25)
Single
44J22
44J22
66K63
44J22
66K63
Ten Pack
66K63
Size of filter − in. (mm)
16 x 25 x 1
(406 x 635 x 25)
16 x 25 x 1
(406 x 635 x 25)
16 x 25 x 1
(406 x 635 x 25)
EZ Filter Base
Catalog No. − Ship. Wt. − lbs. (kg)
73P56 − 7 (3)
73P57 − 8 (4)
73P58 − 10 (5)
Size of field provided filter − in.
(mm)
16 x 25 x 1
(406 x 635 x 25)
20 x 25 x 1
(508 x 635 x 25)
24 x 24 x 1
(610 x 610 x 25)
CABINET ACCESSORIES
Down−Flow Additive Base
Horizontal Support Frame Kit
Return Air Base
11M60
56J18
76M88
11M61
56J18
74M74
11M62
56J18
74M75
CONDENSATE DRAIN KITS
Condensate Drain Heat Cable
6 ft. (1.8 m)
24 ft. (7.3 m)
50 ft. (15.2 m)
26K68
26K69
26K70
39G04
39G03
76M20
26K68
26K69
26K70
39G04
39G03
76M20
26K68
26K69
26K70
39G04
39G03
76M20
Heat Cable Tape
Fiberglass − 1/2 in. x 66 ft.
Aluminum foil − 2 in. x 60 ft.
Condensate Trap Alternate Location Kit − Up−Flow Only
CONTROLS
Twinning Kit
15L38
15L38
15L38
TERMINATION KITS − See Installation Instructions for specific venting information.
4
Termination
Concentric
1−1/2 in. (38 mm)
2 in. (51 mm)
3 in. (76 mm)
2 in. (51 mm)
3 in. (76 mm)
71M80
− − −
− − −
69M29
60L46
− − −
− − −
− − −
Kits
Direct Vent
Applications
Only
− − −
60L46
− − −
Wall − Close
Couple
22G44
44J40
30G28
81J20
15F75
15F74
44J40
− − −
44J40
− − −
Close Couple WTK − 2 in. (51 mm)
3 in. (76 mm)
81J20
15F75
15F74
81J20
− − −
2, 4
Termination
Kits − Direct or
Non−Direct Vent
Roof
Wall − Wall Ring
Kit
2 in. (51 mm)
2 in (51 mm)
3
15F74
4
Roof Termination Flashing Kit − Direct or Non−Direct
Vent − Contains two flashings.
44J41
44J41
44J41
1
2
3
Cleanable polyurethane frame type filter.
Kits contain enough parts for two, non−direct vent installations.
Non−direct vent only.
GAS HEAT ACCESSORIES
1
High Altitude
Orifice Kit
Natural Gas Only
High Altitude Pressure
Switch Kit
LPG/Propane Kit
Input
4501−7500 ft.
(1372−2286 m)
7501−10,000 ft.
(2286−3048 m)
0−7500 ft.
(0−2286 m)
7501−10,000 ft.
(2286−3048 m)
−045
−070
−090
−110
−135
59M16
59M16
59M16
59M16
59M16
− − −
95M22
56M06
56M07
56M07
60M35
83M74
83M74
83M74
83M74
83M74
83M75
83M75
83M75
83M75
83M75
56M05
75M20
75M20
56M04
1
Required for proper operation at altitudes from 7501 to 10,000 ft. (2286 to 3048 m).
G43UF / Page 6
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EXHAUST PIPE VENTING TABLE
1
Maximum Equivalent Vent Length − One or Two Pipe Applications
2
Vent Size
(diameter)
G43UF−24B−070
G43UF−36B−070
G43UF−36C−090
G43UF−48C−090
G43UF−48C−110
G43UF−60C−110
3
Altitude
G43UF−24B−045
G43UF−60D−135
2
ft.
m
ft.
m
ft.
m
15
31
38
69
15
31
38
69
9
ft.
30
m
9
ft.
m
0 − 2000 ft.
(0 − 609 m)
2 in.
2−1/2 in.
3 in.
110
135
160
250
110
135
160
250
110
135
160
250
110
135
160
250
34
41
49
76
34
41
49
76
34
41
49
76
34
41
49
76
70
21
41
49
76
21
41
49
76
21
41
49
76
21
41
49
76
50
n/a
n/a
125
n/a
n/a
135
160
250
70
100
125
225
50
70
21
38
61
6
4
4
125
200
20
38
55
4 in.
180
n/a
n/a
2001 − 4500 ft.
(610 − 1371 m)
2 in.
n/a
n/a
2−1/2 in.
3 in.
135
160
250
70
100
125
225
30
70
21
38
61
n/a
21
38
61
n/a
21
38
61
4
4
125
200
n/a
70
90
27
55
4 in.
180
n/a
n/a
4501 − 7500 ft.
(1372 − 2286 m)
2 in.
n/a
n/a
2−1/2 in.
3 in.
135
160
250
70
100
125
225
n/a
31
38
69
n/a
31
38
69
4
4
125
200
n/a
70
90
27
55
4 in.
180
n/a
n/a
7501 − 10,000 ft.
(2287 − 3048 m)
2 in.
n/a
n/a
2−1/2 in.
3 in.
135
160
250
100
125
225
4
4
125
200
90
27
55
4 in.
180
NOTE − Minimum Equivalent Vent Pipe length is 15 feet (4.6 m).
1
ꢁMaximum Equivalent Vent Length" permitted is defined as ꢁTotal Length (linear feet) of vent pipe, plus equivalent length (ft.) of fittings, plus equivalent length (ft.) of termination".
110 models must have the supplied 90° street ell installed directly into the unit flue collar. The street ell must be included in the elbow count.
135 models must have 3 in. to 2 in. reducing elbow (supplied) installed directly into the flue collar. Reducing ell must be included in elbow count.
2
3
4
90_
elbows must be limited to 3 in. sweep type elbows.
VENTING NOTES ꢂ One 90_elbow is equivalent to 5 feet (1.5 m) of straight vent pipe.
Two 45_ elbows are equal to one 90_ elbow.
One 45_ elbow is equivalent to 2.5 feet (.75 m) of straight vent pipe.
Wall and roof termination (non−concentric) exhaust pipe must terminate with reducer to improve exhaust velocity away from intake piping.
045 and 070 − 2, 2−1/2, 3 or 4 in. − terminate with 1−1/2 in. pipe
090 − 2, 2−1/2, 3 or 4 in. − terminate with 2 in. pipe
110 − 2, 2−1/2, 3 or 4 in. − terminate with 2 in. pipe
135 − 3 or 4 in. − terminate with 2 in. pipe
TERMINATION KITS − EQUIVALENT VENT LENGTHS
Vent Pipe Equivalent Length − ft. (m)
Outdoor Exhaust
Accelerator
(Diameter X Length)
Concentric
Kits
Close Couple
Kits
Wall Ring
Kit
Vent Pipe
Diameter
Heat
Size
1−1/2 in.
(38 mm)
2 in.
(51 mm)
3 in.
(76 mm)
2 in.
(51 mm)
3 in.
(76 mm)
2 in. 1−1/2 x 12 in. 2 x 12 in.
(51 mm) (38 x 305 mm) (51 x 305 mm)
22G44 44J40
30G28 (WTK) 81J20 (WTK)
in.
mm
71M80
69M29
60L46
15F74
− − −
− − −
1
2
51
12 (3.6) not allowed not allowed
15 (4.6) not allowed not allowed
21 (6.4) not allowed not allowed
4 (1.2)
5 (1.5)
4 (1.2)
5 (1.5)
7 (2.1)
14 (4.3)
4 (1.2)
5 (1.5)
8 (2.4)
14 (4.3)
4 (1.2)
5 (1.5)
7 (2.1)
14 (4.3)
4 (1.2)
5 (1.5)
8 (2.4)
14 (4.3)
4 (1.2)
5 (1.5)
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
1 (0.3)
1
1
2−1/2 64
−045
−070
−090
3
4
2
76
7 (2.1)
7 (2.1)
1
102 42 (12.8) not allowed not allowed
14 (4.3)
14 (4.3)
1
1
1
51
12 (3.6) not allowed not allowed
15 (4.6) not allowed not allowed
24 (7.3) not allowed not allowed
4 (1.2)
4 (1.2)
2−1/2 64
5 (1.5)
5 (1.5)
3
4
2
76
8 (2.4)
8 (2.4)
1
102 42 (12.8) not allowed not allowed
14 (4.3)
14 (4.3)
2
51 not allowed
3 (1)
3 (1)
6 (1.8)
6 (1.8)
12 (3.7)
3 (1)
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
1 (0.3)
2 (0.6)
2 (0.6)
4 (1.2)
1 (0.3)
2 (0.6)
2 (0.6)
4 (1.2)
6 (1.8)
1 (0.3)
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
2
2−1/2 64 not allowed
6 (1.8)
6 (1.8)
2 (0.6)
2 (0.6)
2
3
4
2
76 not allowed
2 (0.6)
2 (0.6)
2
102 not allowed 12 (3.7)
4 (1.2)
4 (1.2)
2
51 not allowed
3 (1)
1 (0.3)
1 (0.3)
3
2−1/2 64 not allowed
6 (1.8)
6 (1.8)
6 (1.8)
6 (1.8)
12 (3.7)
2 (0.6)
2 (0.6)
−110
−135
3
3
4
3
4
76 not allowed
2 (0.6)
2 (0.6)
3
102 not allowed 12 (3.7)
4 (1.2)
4 (1.2)
3
76 not allowed not allowed 15 (4.6)
102 not allowed not allowed 25 (7.6)
6 (1.8)
6 (1.8)
3
10 (3.0)
10 (3.0) not allowed
10 (3.0)
1
2
3
Requires field provided 1−1/2 in. (38 mm) outdoor exhaust accelerator.
Requires field provided 2 in. (51 mm) outdoor exhaust accelerator.
For use only in non−direct vent applications, when snow riser is not required. Requires field provided 2 in. (51 mm) outdoor exhaust accelerator.
G43UF / Page 7
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FILTER AIR RESISTANCE
HIGH ALTITUDE INFORMATION
For 1 Inch (25 mm) Cleanable Filter (Field Provided)
Pressure regulator adjustment may be required depending on
altitude. See below for proper pressure regulator setting.
cfm
0
L/s
0
in. w.g.
0.00
0.01
0.03
0.04
0.06
0.09
0.12
0.15
0.19
0.23
0.27
0.33
0.38
0.44
Pa
0
Manifold Pressure
(Outlet)
in. w.g. (kPa)
200
95
0
Fuel
Altitude − ft. (m)
400
190
285
380
470
565
660
755
850
945
1040
1130
1225
5
Natural
0−4500 (0−1372)
3.5 (0.87)
600
10
15
20
30
35
45
55
65
80
95
110
2
4501−7500 (1373−2286)
7501−10000 (2287−3048)
0−4500 (0−1372)
3.5 (0.87)
800
1,2
3.5 (0.87)
1000
1200
1400
1600
1800
2000
2200
2400
2600
3
LPG
Propane
10.0 (2.49)
2
4501−7500 (1373−2286)
7501−10,000 (0−3048)
10.0 (2.49)
2
10.0 (2.49)
1
2
High Altitude Orifice Kit required, see Gas Heat Accessories table for order number.
High Altitude Pressure Switch Kits as required, see Gas Heat Accessories table for
order number.
3
LPG/Propane conversion kit required, see Gas Heat Accessories table for order
number.
INSTALLATION CLEARANCES
1
INSTALLATION CONFIGURATIONS
AIR FLOW
Sides
Rear
0 inches (0 mm)
VENT
PIPING
0 inches (0 mm)
Top/Plenum
Front
1 inch (25 mm)
0 inches (0 mm)
NOTE − The vent
piping and conden-
sate drain can be
moved to the other
side of the unit. Vent
piping and drain
must be installed on
the same side of the
unit with each other
unless optional Con-
densate Trap Alter-
Front (service/alcove)
Floor
24 inches (610 mm)
HEAT
EXCHANGER
2
Combustible
NOTE − Air for combustion and supply air ventilation must conform to the methods
outlined in American National Standard (ANSI-Z223.1) National Fuel Gas Code or
National Standard of Canada CAN/CGA-149.1, & CAN/CGA-149.2 ꢁInstallation Code
for Gas Burning Appliances".
NOTE−In the U.S. flue sizing must conform to the methods outlined in current
GAMA/A.G.A. venting tables, American National Standard (ANSI-Z223.1) National
Fuel Gas Code or applicable provisions of local building codes. In Canada flue sizing
must conform to the methods outlined in National Standard of Canada
CAN/CGA-149.1 and .2.
CONDENSATE
DRAIN
nate Location Kit is
used.
1
BLOWER
Allow proper clearances to accommodate condensate trap and vent pipe installation.
Do not install the furnace directly on carpeting, tile, or other combustible materials other
than wood flooring.
2
G43UF / Page 8
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DIMENSIONS − INCHES (MM)
1
NOTE − 60C and 60D size units that require air volumes over
1800 cfm (850 L/s) must have one of the following:
a. Single side return air with transition, to accommodate
20 x 25 x 1 in. (508 x 635 x 25 mm) air filter. Required to
maintain proper air velocity.
SUPPLY AIR
OPENING
b. Single side return air with optional RAB Return Air Base
c. Bottom return air.
d. Return air from both sides.
e. Bottom and one side return air.
See Blower Performance Tables for additional information.
2
Optional External Side Return Air Filter Kit is not for use with the
optional RAB Return Air Base.
23-3/4 (603)
2
OPTIONAL
EXTERNAL
25 (635)
TOP VIEW
SIDE RETURN
AIR FILTER KIT
(Either Side)
28−1/2
(724)
A
B
9/16
(14)
19−7/16
(494)
9/16 (14)
COMBUSTION AIR INTAKE
(Either Side)
6−1/2
(165)
3−1/8
(79)
11−5/8 (295)
Right
EXHAUST AIR OUTLET
(Either Side)
4−1/8
(103)
6−3/4
(171)
9−3/4 (248)
Left
2
OPTIONAL
GAS PIPING INLET
(Either Side)
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
CONDENSATE
TRAP CONNECTION
(Either Side)
4−7/8 (124) Right
2−1/4 (57) Left
40
(1016)
ELECTRICAL INLET
(Either Side)
2−1/2
(64)
23
(584)
4
(102)
14−3/4
(375)
16
18-3/4 (476)
1
14
(356)
OPTIONAL
RETURN CUTOUT
(Either Side)
(406)
AIR FLOW
1−15/16 (49)
5/8 (16)
3/4 (19)
23−1/2
(597)
C
4−1/4
(108)
1
1
3/4 (19)
Bottom Return
Air Opening
Bottom Return
Air Opening
FRONT VIEW
SIDE VIEW
A
B
C
Model No.
in.
mm
in.
mm
in.
mm
G43UF−24B−045
G43UF−24B−070
G43UF−36B−070
17−1/2
446
16−3/8
416
16
406
G43UF−36C−090
G43UF−48C−090
G43UF−48C−110
G43UF−60C−110
21
533
622
19−7/8
23−3/8
454
546
19−1/2
23
495
584
G43UF−60D−135
24−1/2
G43UF / Page 9
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OPTIONAL ACCESSORY DIMENSIONS − INCHES (MM)
RAB RETURN AIR BASE (Up−Flow Applications Only)
For use with B, C, and D size furnaces only
4
(102)
CONDENSATE
TRAP
1
23 (584)
Overall
(Maximum)
4
(102)
1
Minimum
11 (279)
Maximum
14 (356)
14
(356)
14
(356)
1
2
18−1/2
(470)
Overall
1
Unit side return
air Opening
AIR FLOW
FURNACE
FRONT
(Maximum)
SIDE RETURN
AIR OPENINGS
(Either Side)
5
(102)
6 (152)
3/4
(19)
20−1/2 (521)
OPTIONAL RAB
RETURN AIR BASE
17−1/2 (446) RAB−B−6 (76M88)
21 (533) RAB−C−6 (74M74)
24−1/2 (622) RAB−D−6 (74M75)
7/8
(22)
27−5/8 (702)
SIDE VIEW
FRONT VIEW
1
2
Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.
Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in. (584 x 279 mm).
The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown.
Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air
opening. The size of the opening must not extend beyond the markings on the furnace cabinet.
14 inches (356 mm) is the maximum size the height of the unit opening can be cut. This may interfere with the condensate drain
(if located on the same side of the unit as the opening).
To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.
NOTE− Optional Side Return Air Filter Kits are not for use with RAB Return Air Base.
DIMENSIONS − INCHES (MM) − FURNACE/COIL COMBINED DIMENSIONS
Cased
Uncased (CX34 − cased only)
A
B
A
B
Model No
UP−FLOW POSITION
in. mm in.
mm
in.
mm
in.
mm
CX34−18/24B−6F C33−24B
CX34−18/24C−6F C33−24C
16−1/2 419 56−1/2 1435 13−7/8 352 53−7/8 1368
19−1/2 495 59−1/2 1511 15−7/8 403 55−7/8 1419
20−1/2 521 60−1/2 1537 17−3/4 451 59−3/4 1467
CX34−25B−6F
C33−25B
CX34−30B−6F
CX34−30C−6F
C33−30B
C33−30C
A
CX34−31B−6F
CX34−36B−6F
CX34−36C−6F
CX34−38B−6F
CX34−42B−6F
CX34−43B−6F
CX34−43C−6F
C33−31B
C33−36B
C33−36C
C33−38B
C33−42B
C33−43B
C33−43C
C33−44C
23−1/2 597 63−1/2 1613 20−1/4 514 60−1/4 1530
24−1/2 622 64−1/2 1638 21−7/8 556 61−7/8 1572
24−1/2 622 64−1/2 1638 21−1/4 540 61−1/4 1556
B
24−1/2 622 64−1/2 1638 22
559
62
1575
24−1/2 622 64−1/2 1638 21−7/8 556 61−7/8 1572
28−1/2 724 68−1/2 1740 26−1/4 667 66−1/4 1683
28−1/2 724 68−1/2 1740 25−3/4 654 65−3/4 1670
24−1/2 622 64−1/2 1638 21−1/2 546 61−1/2 1562
24−1/2 622 64−1/2 1638 22−1/8 562 62−1/8 1578
24−1/2 622 64−1/2 1638 21−1/2 546 61−1/2 1562
30−1/2 775 70−1/2 1791 28−1/2 724 68−1/2 1740
40
(1016)
CX34−44/48B−6F C33−48B
CX34−44/48C−6F C33−48C
CX34−49C−6F
C33−49C
CX34−50/60C−6F C33−50/60C 27−1/2 699 67−1/2 1715 24−3/4 629 64−3/4 1645
CX34−60D−6F
CX34−62C−6F
CX34−62D−6F
C33−60D
C33−62C
C33−62D
25−1/2 648 65−1/2 1664 24−3/4 629 64−3/4 1645
32−1/2 826 72−1/2 1842 30−5/8 778 70−5/8 1793
29−1/2 749 69−1/2 1765 28−3/4 730 68−3/4 1746
G43UF / Page 10
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OPTIONAL ACCESSORY DIMENSIONS − INCHES (MM)
CONCENTRIC WALL
TERMINATION APPLICATIONS
CONCENTRIC ROOF
TERMINATION APPLICATIONS
FLASHING
(Not Furnished)
10-1/2
(267)
12 (305)
Minimum
Above Average
Snow
Accumulation
OUTSIDE
WALL
INTAKE
AIR
EXHAUST
AIR
EXHAUST
AIR
SHEET METAL STRAP
(Clamp and sheet metal strap
must be field installed to support
the weight of the termination kit.)
12 (305)
Minimum
Above
INTAKE
AIR
INTAKE
AIR
CLAMP
(Not Furnished)
Grade
CLAMP
GRADE
71M80 ꢂ 1−1/2 inch (38 mm)
69M29 ꢂ 2 inch (51 mm)
See Installation Instructions for specific usage.
60L46 ꢂ 3 inch (76 mm)
See Installation Instructions for specific usage.
2 x 1-1/2 in. (51 x 38 mm) 60G77
3 x 2 in. (76 x 51 mm) 33K97
REDUCER BUSHING (Furnished)
46−3/4
(1187)
37
(940)
6−1/2
(165)
INTAKE AIR
4−1/2 (114)
3 (76)
INTAKE AIR
EXHAUST
AIR
TERMINATION
ASSEMBLY
(Furnished)
INTAKE AIR
EXHAUST
AIR
CLAMP
(Furnished)
ELBOW
(Furnished)
TERMINATION
ASSEMBLY
(Furnished)
ELBOW
(Field Supplied)
WALL ASSEMBLY TERMINATION KIT − RING KIT
15F74 − 2 inch (51 mm)
See Installation Instructions for specific usage.
NON−DIRECT VENT APPLICATION
NOTE ꢂ EXHAUST PIPE SHOWN
Kit Contains Enough Parts For Two Installations
DIRECT VENT APPLICATION
NOTE − 12 in. (305 mm) minimum height above
average snow accumulation.
NOTE ꢂ 12 in. (305 mm) minimum height above
average snow accumulation.
12 in. (305 mm) maximum
without support
12 in. (305 mm) maximum
without support
6 in. (152 mm)
maximum
8 in. (203 mm)
minimum
G43UF / Page 11
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OPTIONAL ACCESSORY DIMENSIONS − INCHES (MM)
DIRECT VENT APPLICATIONS
WALL TERMINATION KITS (CLOSE-COUPLE) − 22G44 − 2 inch (51 mm) or 44J40 − 3 inch (76 mm)
See Installation Instructions for specific usage.
If Intake and Exhaust Pipe is less than
12 in. (305 mm) above snow accumula-
tion or other obstructions, field fabri-
cated piping must be installed.
EXHAUST
AIR
12
(305)
INSULATION
(Not Furnished)
INTAKE
AIR
INTAKE
AIR
EXHAUST
AIR
5 (127)
2
12 (305)
Minimum
ABOVE GRADE
(51)
5-1/2
(140)
12
12
(305)
(305)
GRADE
GRADE
WTK WALL ASSEMBLY TERMINATION KIT WITH FIELD FABRICATED ABOVE GRADE EXTENDED CLEARANCE
30G28 − 2 inch (51 mm) or 81J20 − 3 inch (76 mm)
See Installation Instructions for specific usage.
If Intake and Exhaust Pipe is less than
12 in. (305 mm) above snow accumula-
tion or other obstructions, field fabri-
cated piping must be installed.
EXHAUST
AIR
12
(305)
INSULATION
(Not Furnished)
INTAKE
AIR
EXHAUST
AIR
INTAKE
AIR
5
(127)
8 (203)
Minimum
12 (305)
Maximum
12 (305)
Minimum
ABOVE GRADE
5-1/2
(140)
GRADE
GRADE
G43UF / Page 12
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BLOWER/WATTS DATA
G43UF−24B−045 PERFORMANCE (Less Filter)
External Static
Pressure
Air Volume / Watts at Different Blower Speeds
Medium−High Medium−Low
High
Low
in. w.g.
Pa
0
cfm
1125
1115
1090
1060
1020
970
L/s
530
525
515
500
480
460
435
405
360
320
Watts
425
410
395
380
365
345
335
315
295
275
cfm
900
905
895
880
860
835
795
730
665
585
L/s
425
425
420
415
405
395
375
345
315
275
Watts
cfm
745
760
755
740
720
700
665
620
560
495
L/s
350
360
355
350
340
330
315
295
265
235
Watts
cfm
690
695
685
675
665
640
600
565
510
465
L/s
325
330
325
320
315
300
285
265
240
190
Watts
265
260
255
250
240
230
220
215
200
175
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
360
350
335
325
315
300
290
270
250
230
295
285
280
270
260
255
240
230
215
200
25
50
75
100
125
150
175
200
225
920
860
760
675
G43UF−24B−070 PERFORMANCE (Less Filter)
External Static
Pressure
Air Volume / Watts at Different Blower Speeds
Medium−High Medium−Low
High
Low
in. w.g.
Pa
0
cfm
1115
1115
1100
1080
1050
1010
980
L/s
525
525
520
510
495
475
460
440
405
365
Watts
435
425
415
400
385
365
355
340
320
295
cfm
875
865
870
870
855
835
810
770
720
650
L/s
415
410
410
410
405
395
380
365
340
305
Watts
cfm
720
725
730
725
715
695
675
640
585
525
L/s
340
340
345
340
335
330
320
300
275
245
Watts
cfm
665
670
665
655
645
625
600
565
520
465
L/s
315
315
315
310
305
295
285
265
245
220
Watts
255
255
250
240
240
230
225
215
200
190
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
360
350
335
330
320
310
295
285
270
250
290
285
280
270
265
255
250
235
220
205
25
50
75
100
125
150
175
200
225
930
855
770
G43UF−36B−070 PERFORMANCE (Less Filter)
External Static
Pressure
Air Volume / Watts at Different Blower Speeds
Medium−High Medium−Low
High
Low
in. w.g.
Pa
0
cfm
1640
1600
1540
1495
1420
1360
1275
1170
1080
945
L/s
775
755
725
705
670
640
600
555
510
445
Watts
660
635
605
580
545
525
490
465
440
400
cfm
1415
1395
1370
1345
1275
1245
1165
1085
1010
840
L/s
665
660
650
635
605
590
550
515
475
395
Watts
cfm
1160
1160
1160
1145
1125
1080
1025
965
L/s
545
545
545
540
530
510
485
430
410
360
Watts
cfm
1005
1000
995
990
965
945
900
860
775
710
L/s
475
470
470
465
455
445
425
405
365
335
Watts
410
385
375
365
345
325
305
295
270
245
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
575
550
525
505
480
450
410
385
360
320
485
460
445
425
395
375
350
335
310
275
25
50
75
100
125
150
175
200
225
865
765
G43UF−36C−090(H) PERFORMANCE (Less Filter)
External Static
Pressure
Air Volume / Watts at Different Blower Speeds
Medium−High Medium−Low
High
Low
in. w.g.
Pa
0
cfm
1630
1620
1590
1550
1520
1465
1415
1350
1260
1165
L/s
770
765
750
730
715
690
670
635
595
550
Watts
745
715
680
655
630
605
570
545
510
475
cfm
1360
1365
1365
1355
1330
1300
1250
1215
1140
1035
L/s
640
645
645
640
630
615
590
575
540
485
Watts
cfm
1125
1160
1160
1170
1160
1140
1095
1065
1005
900
L/s
530
545
545
550
545
540
515
500
475
425
Watts
cfm
975
1000
990
985
980
960
940
905
850
730
L/s
460
470
465
465
460
455
445
425
400
345
Watts
440
430
405
395
380
360
350
335
310
285
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
635
610
580
565
545
515
490
470
440
395
540
515
495
475
460
440
420
400
375
335
25
50
75
100
125
150
175
200
225
NOTES − All air data is measured external to unit without filter (not furnished − field provided).
Air volume based on bottom air return air. Actual air volume may vary on side return air applications.
G43UF / Page 13
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BLOWER/WATTS DATA
G43UF−48C−090 PERFORMANCE (Less Filter)
External Static
Pressure
Air Volume / Watts at Different Blower Speeds
Medium−High Medium−Low
High
Low
in. w.g.
Pa
0
cfm
L/s
1030
1005
985
955
915
880
820
775
725
630
Watts
930
885
840
800
760
725
670
640
600
540
cfm
1835
1825
1810
1775
1735
1660
1590
1475
1340
1170
L/s
865
860
855
835
820
785
750
695
630
555
Watts
cfm
1520
1510
1505
1500
1480
1430
1380
1290
1175
1070
L/s
715
710
710
705
700
675
650
610
555
505
Watts
cfm
1280
1275
1270
1265
1250
1215
1175
1105
1020
950
L/s
605
600
600
595
590
575
555
520
480
450
Watts
510
495
475
460
440
425
410
375
355
330
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
2180
2135
2085
2030
1940
1865
1740
1645
1540
1335
790
750
720
685
650
600
575
520
465
440
630
610
580
565
535
505
475
450
405
375
25
50
75
100
125
150
175
200
225
G43UF−48C−110(H) PERFORMANCE (Less Filter)
Air Volume / Watts at Different Blower Speeds
Medium−High Medium−Low
External Static
Pressure
High
Low
in. w.g.
Pa
0
cfm
L/s
1020
990
960
925
890
840
800
745
650
580
Watts
880
850
805
750
725
680
660
620
550
520
cfm
1880
1855
1815
1755
1715
1630
1550
1410
1230
1120
L/s
890
875
860
830
810
770
735
665
580
530
Watts
cfm
1490
1480
1475
1475
1465
1420
1360
1210
1125
1050
L/s
705
700
695
695
690
670
640
570
530
495
Watts
cfm
1235
1230
1225
1220
1215
1150
1110
1035
970
L/s
580
580
580
575
575
540
525
490
460
420
Watts
485
475
460
445
430
400
380
350
325
310
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
2160
2100
2035
1965
1885
1780
1690
1575
1375
1225
755
730
690
650
625
580
550
505
450
415
602
585
560
545
510
490
460
405
380
365
25
50
75
100
125
150
175
200
225
885
NOTES − All air data is measured external to unit without filter (not furnished − field provided).
Air volume based on bottom air return air. Actual air volume may vary on side return air applications.
G43UF−60C−110 PERFORMANCE (Less Filter) − Single Side Return Air − Air volumes in bold require field fabricated transi-
tion to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) air filter in order to maintain proper air velocity.
External Static
Pressure
Air Volume / Watts at Different Blower Speeds
Medium−High Medium−Low
High
Low
in. w.g.
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
Pa
0
cfm
2625
2570
2410
2425
2335
2270
2170
2110
2035
1900
L/s
Watts
1350
1330
1305
1265
1220
1195
1155
1130
1090
1055
cfm
L/s
1090
1095
1080
1055
1025
1000
965
Watts
cfm
L/s
890
900
910
905
900
895
875
845
825
785
Watts
cfm
L/s
715
745
765
770
775
775
770
750
725
695
Watts
700
700
690
675
660
640
630
610
580
565
1240
1215
1135
1145
1100
1070
1025
995
2310
2325
2285
2230
2175
2120
2045
1950
1885
1760
1080
1060
1035
990
1885
1910
1930
1925
1910
1895
1860
1795
1745
1665
885
865
845
825
810
785
765
730
705
680
1515
1575
1620
1635
1640
1640
1630
1590
1540
1470
25
50
75
100
125
150
175
200
225
950
935
885
920
855
960
890
820
895
830
780
G43UF−60C−110 PERFORMANCE (Less Filter) − Bottom Return Air, Side Return Air with Optional RAB Return Air Base, Re-
turn Air from Both Sides or Return Air from Bottom and One Side.
External Static
Pressure
Air Volume / Watts at Different Blower Speeds
Medium−High Medium−Low
High
Low
in. w.g.
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
Pa
0
cfm
L/s
Watts
1385
1355
1315
1275
1250
1205
1185
1150
1090
1050
cfm
L/s
1135
1125
1110
1080
1055
1025
990
Watts
cfm
L/s
970
955
955
955
960
930
905
880
855
805
Watts
cfm
L/s
765
815
795
800
800
820
810
795
765
725
Watts
710
735
690
675
660
665
650
635
610
590
2720
2665
2585
2505
2435
2350
2255
2160
2020
1910
1285
1255
1220
1180
1150
1110
1065
1020
955
2410
2385
2350
2290
2235
2170
2100
2005
1905
1820
1090
1075
1015
990
940
930
895
840
825
795
2055
2025
2030
2025
2030
1975
1915
1865
1810
1705
935
885
865
840
830
790
765
730
710
675
1620
1730
1680
1695
1695
1735
1720
1680
1625
1540
25
50
75
100
125
150
175
200
225
945
900
900
860
NOTES − All air data is measured external to unit without filter (not furnished − field provided).
G43UF / Page 14
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BLOWER/WATTS DATA
G43UF−60D−135 PERFORMANCE (Less Filter) − Single Side Return Air − Air volumes in bold require field fabricated transi-
tion to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) air filter in order to maintain proper air velocity.
External Static
Pressure
Air Volume / Watts at Different Blower Speeds
Medium−High Medium−Low
High
Low
in. w.g.
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
Pa
0
cfm
L/s
Watts
1440
1405
1370
1330
1290
1265
1230
1190
1160
1110
cfm
L/s
1095
1090
1075
1055
1025
1000
970
Watts
cfm
L/s
880
905
910
905
900
890
865
845
810
780
Watts
cfm
L/s
665
690
740
750
750
755
745
730
715
680
Watts
690
685
675
670
655
645
630
605
590
570
2665
2615
2530
2470
2380
2310
2200
2120
2025
1930
1260
1235
1195
1165
1125
1090
1035
1000
955
2325
2310
2280
2235
2175
2120
2055
1970
1890
1800
1100
1065
1055
1015
985
1865
1915
1925
1920
1910
1890
1835
1790
1720
1655
890
865
850
825
805
790
765
740
710
685
1410
1465
1570
1590
1590
1595
1580
1545
1515
1440
25
50
75
100
125
150
175
200
225
965
935
930
900
890
875
910
850
835
NOTES − All air data is measured external to unit without filter (not furnished − field provided).
G43UF−60D−135 PERFORMANCE (Less Filter) − Bottom Return Air, Side Return Air with Optional RAB Return Air Base,
Return Air from Both Sides or Return Air from Bottom and One Side.
External Static
Pressure
Air Volume / Watts at Different Blower Speeds
Medium−High Medium−Low
High
Low
in. w.g.
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
Pa
0
cfm
2730
2670
2600
2525
2445
2360
2290
2205
2110
1970
L/s
Watts
1465
1440
1400
1360
1325
1280
1255
1220
1195
1120
cfm
L/s
1145
1135
1115
1095
1065
1035
1005
960
Watts
cfm
L/s
970
975
965
960
955
925
895
860
830
795
Watts
cfm
L/s
735
750
765
760
760
760
755
740
725
725
Watts
680
675
665
655
645
635
615
600
580
545
1290
1260
1225
1190
1155
1115
1080
1040
995
2425
2400
2365
2315
2260
2195
2130
2035
1945
1835
1125
1100
1070
1045
1015
985
2055
2065
2045
2035
2020
1960
1900
1825
1765
1680
915
890
865
845
820
790
755
730
710
690
1560
1590
1620
1615
1615
1610
1600
1570
1540
1540
25
50
75
100
125
150
175
200
225
965
910
915
880
930
865
830
NOTES − All air data is measured external to unit without filter (not furnished − field provided).
G43UF / Page 15
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Contact us at 1−800−4−LENNOX
NOTE − Due to Lennox’ ongoing committment to quality, Specifications, Ratings and Dimensions subject to change without notice and without incurring liability.
Improper installation, adjustment, alteration, service or maintenance can cause property damage or personal injury.
Installation and service must be performed by a qualified installer and servicing agency.
©2005 Lennox Industries Inc.
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