®
C-3 and C-4
F O R E M O S T I N A I R F I LT R AT I O N
Crank Lock HEPA Filter Housing
Bulletin PB1604-0107
General
Construction
C-3 and C-4 Side Access HEPA/ULPA Filter Housings
are designed for use with nominal 12 inch deep
HEPA/ULPA filters. They are factory-assembled
flanged units suitable for gel sealed or gasket sealed
HEPA filters. Both the prefilters and the primary
HEPA/ULPA filters are serviceable through the same
gasketed side access door.
Housings are 24 inches deep in the direction of air
flow, (26 inches deep if it has a 4” prefilter section.)
and are constructed in your choce of frame materials.
Flanges are furnished for duct connections on the air
entering and air leaving sides. All joints are intermit-
tently welded and finished to remove all burrs and
sharp edges. The joints are then sealed with silicone
enabling the housing to withstand an internal pressure
of +/- 3.0 in. w.g.
Versatility
C-3 and C-4 housings may be used with Alpha 95 fil-
ters (95% DOP efficiency) and with Alpha Cell and
Alpha 2000 filters (99.97% and 99.99% DOP efficien-
cy). Standard housings accept nominal 12 inch deep
filters and 16” and 18” carbon adsorbers in a variety
of face sizes. They can be arranged from one filter
high and one filter wide to four filters high and eight fil-
ters wide. If large housings are not practical to rig into
place, smaller units may be stacked in the field.
The filter locking mechanism for the fluid gel seal-
model housing is a 300 Series stainless steel hand-
operated arm that moves the filter s gel-filled channel
on to the internal housing knife edge sealing flange.
The same mechanism also pulls the filter away from
the sealing flange when changing filters. The filter
locking mechanism for gasket seal-model housing is a
300 Series stainless steel and brass device. The
mechanism presses the gasketed filter against the
housing s sealing surface by means of a mechanical
bolt and thrust assembly that is manually operated
using a standard 3/4 inch socket or wrench.
Options
• Choce of frame construction materials
• Insulation
Standard 2 inch or 4 inch prefilter tracks will accom-
modate pleated panel filters with efficiency ranges up
to 50% per the ASHRAE Standard 52.2 dust spot test
methods. Access doors have 0.5 in. thick closed cell
neoprene gaskets around the inside perimeter.
Double pin door hinges which pivot, allow the door to
make level contact with the gasket when closed.
Stainless steel wing nuts secure the doors.
• Lifting lugs
• Transitions
• Static pressure ports
• DOP test ports
• High temperature modifications
• Weathercap
• Magnahelic gauges (mounted)
• PrefilterTrack
Important Features
• Choice of frame construction materials
• Stainless steel filter locking mechanism for
strength, durability and long-term integrity
• Access for up to four filters and prefilters wide
per door for quick filter changeout
• Double pin hinges enable the doors to make
level contact with the door gasket for a uni-
formly tight seal
Flanders Filters - Foremost in Air Filtration
Toll Free: 1-800-637-2803
Model Number Development
C3G
-
1H1W
-
GGF
-
GLV
-
D1
Housing Material:
Filter type:
C3G - Gasket Seal
GLV: Galvanized steel
304: Type 304 S/S
304L: Type 304 L S/S
316: Type 316 S/S
316L: Type 316L S/S
C4F - Fluid Seal
Housing Size:
Filters High x Wide
(See Chart)
ALZ - 14 gauge aluminized
(non-standard)
Filter Size:
CCF - 12”x12”x11-1/2” HEPA Filter
2CCF -12”x12”x11-1/2” HEPA filter with a 2” prefilter
4CCF -12”x12”x11-1/2” HEPA filter with a 4” prefiler
CGF - 12”x24”x11-1/2” HEPA Filter
Door Locations
2CGF- 12”x24”x11-1/2” HEPA Filter with 2” prefilter
4CGF- 12”x24”x11-1/2” HEPA filter with a 4” prefilter
GCF- 24”x12”x11-1/2” HEPA filter
D1- Filter access and housing on
one side only
D1A - Doors on both sides, but filter
access from one side only.
2GCF- 24”x12”x11-1/2” HEPA filter with 2” prefilter
4GCF- 24”x12”x11-1/2” HEPA filter with 4” prefilter
GGF- 24”x24”x11-1/2” HEPA filter
D2 - Doors on both sides and filter
access from both sides.
2GGF-24”x24”x11-1/2” HEPA filter with 2” prefilter
4GGF-24”x24”x11-1/2” HEPA filter with 4” prefilter
CC12- 12”x12”x11-1/2” carbon adsorber
CG12- 12”x24”x11-1/2” carbon adsorber
GC12- 24”x12”x11-1/2” carbon adsorber
GG12- 24”x24”x11-1/2” carbon adsorber
CG16- 12”x24”x16” carbon adsorber
The filter size arrangements listed at left are the only standard
arrangements. 6” prefilters are available but non-standard.
Any prefilter with a carbon housing is available but not standard.
Multi-wide CC, CG and GC units are available but non-standard.
CC16, CC18, CG18 & GC18 units are not available.
GC16- 24”x12”x16” carbon adsorber
GG16- 24”x24”x16” carbon adsorber
GG18- 24”x24”x18” carbon adsorber.
Filter Usage and Housing Weight
Height
Code
Filters/
Weight
Width Code
1W
2W
3W
4W
5W
6W
7W
7
8W
8
1H
Filters
1
2
3
4
5
6
Weight
105
190
270
380
460
540
2H
3H
4H
Filters
Weight
Filters
Weight
Filters
Weight
2
200
3
4
305
6
6
8
610
12
10
765
15
12
920
18
14
21
28
16
24
32
460
9
255
4
405
8
590
12
810
16
995
20
1180
24
345
520
710
1040
1230
1420
(1) Filters/Weight: Top number indicates the number of filters required to fill the unit. Bottom number indicates the
approximate weight in pounds of the housing EMPTY. Add 32 pounds for each HEPA/ULPA filter and 2 pounds per each
prefilter to determine approximate weight when loaded with filters.
Add 10% to calculate the approximate rigging weight of housings
Flanders Filters - Foremost in Air Filtration
Toll Free: 1-800-637-2803
Construction Details
Notes:
1. Standard construction is 14 ga. galvanized steel housing and doors leak tight to +/- 3.0 in. w.g.
2. Maximum operating temperature for standard C-3 and C-4 Housings is 250°F. High temperature C-3 and C-4 Housings
are available for 400°F continuous and 500 °F intermittent duty.
Guide Specifications
1.0 HEPA/ULPA Filter Housings
hand-operated arm that moves the filter so its gel-
filled channel mates with the internal housing knife
edge sealing flange. The same mechanism shall
also pull the filter away from the sealing flange
when changing filters.
1.1 Side access HEPA filter housings shall be C-3 and
C-4 as manufactured by Flanders.
1.2 Units shall be factory-assembled housings with
flanges for duct connections on the air entering
and air leaving sides.
2.4 The filter locking mechanism for the gasket seal
model housing shall be a 300 Series stainless
steel and brass device. The mechanism shall
press the gasketed filter against the housing’s
sealing surface by means of a mechanical bolt and
thrust assembly that is manually operated using a
standard 3/4 inch socket or wrench.
1.3 Housings shall be suitable for operation at +/- 3.0
in. w.g. internal pressure.
2.0 Construction
2.1 Housings shall be made of galvanized or stainless
steel with 11 ga. corner posts. Joints shall be inter-
mittently welded and sealed with silicone.
3.0 Features
2.2 Tracks for prefilters shall be fabricated from the
same material as the housing.
3.1 Model numbers and capacities shall be as speci-
fied and/or shown on the drawings.
2.3 The filter locking mechanism for the gel seal
model shall be a 300 Series stainless steel
3.2 Provide options as specified.
REPRESENTED BY:
®
Flanders Filters, Inc.
531 Flanders Filter Road
Washington, NC 27889
Phone: (252) 946-8081
Toll Free: (800) 637-2803
Fax: (252) 946-3425
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