Tumblers – 120 and 170
Exhaust Requirements
WARNING
Make-up air openings for a room containing
tumbler(s) and/or gas fired hot water heater or other
gravity vented appliances must be increased
sufficiently to prevent downdrafts in any of the vents
when all tumblers are in operation. Do not locate
gravity vented appliances between tumbler(s) and
make-up air openings. If it is necessary to duct make-
up air to the tumbler(s), increase the area of the
ductwork by 25% to compensate for any restriction in
air movement.
A drying tumble dryer produces
combustible lint. To reduce the risk of fire,
the tumble dryer must be exhausted to the
outdoors.
W057R1
To reduce the risk of fire and accumulation
of combustible gases, DO NOT exhaust
tumble dryer air into a window well, gas
vent, chimney or enclosed, unventilated
area such as an attic wall, ceiling, crawl
space under a building, or concealed
Venting
WARNING
To reduce the risk of fire due to increased
static pressure, we do not recommend
installation of in-line secondary lint filters
or lint collectors. If secondary systems are
mandated, frequently clean the system to
Layout
Whenever possible, install tumblers along an outside
wall where duct length can be kept to a minimum, and
make-up air can be easily accessed. Elbows and long
vents tend to increase drying time. Construction must
not block the airflow at the rear of the tumbler. Doing
so would prevent adequate air supply to the tumbler’s
combustion chamber.
assure safe operation.
W749
IMPORTANT: Installing in-line filters or lint
collectors will cause increased static pressure.
Failure to maintain the secondary lint system will
decrease tumbler efficiency and may void machine
warranty.
Make-Up Air
A tumbler is forced air exhausted and requires
provisions for make-up air to replace the air exhausted
by the tumbler.
For maximum efficiency and minimum lint
accumulation, tumbler air must be exhausted to the
outdoors by the shortest possible route.
IMPORTANT: Do not obstruct the flow of
combustion and ventilation air.
Proper sized exhaust ducts are essential for proper
operation. All elbows should be sweep type. Exhaust
ducts must be assembled so the interior surfaces are
smooth, so the joints do not permit the accumulation
of lint. DO NOT use plastic or thin foil ducts – rigid
metal ducts are recommended. Use exhaust ducts
made of sheet metal or other noncombustible material.
DO NOT use sheet metal screws or fasteners on
exhaust pipe joints which extend into the duct and
catch lint. Use of duct tape or pop-rivets on all seams
and joints is recommended, if allowed by local codes.
Make-up air openings should be as close to the
tumbler(s) as possible.
The required make-up air opening to the outside for
each tumbler is:
Required Make-Up Air Opening
(to the outside) for Each Tumbler
Models
Opening
2
2
360 in. (2323 cm )
Verify that old ducts are thoroughly cleaned out before
installing new tumbler(s).
120 Pound
free air
2
2
525 in. (3710 cm )
170 Pound
free air
WARNING
Table 1
Improperly sized or assembled ductwork
causes excess back pressure which
results in slow drying, lint collecting in the
duct, lint blowing back into the room, and
Make-up air openings with louvers will restrict
airflow. The opening must be increased to compensate
for area taken up by louvers.
increased fire hazard.
W355
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