Alliance Laundry Systems 70269701R4 - Manual (Page 35)

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Exhaust Requirements
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.
Make-Up Air
A tumbler is forced air exhausted and requires
provisions for make-up air to replace the air exhausted
by the tumbler.
IMPORTANT: Do not obstruct the flow of
combustion and ventilation air.
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:
144 square inches (928 sq. cm) for 25, 30 and
35 pound tumbler models
288 square inches (1856 sq. cm) for T30 tumbler
models
Make-up air openings with louvers will restrict
airflow. The opening must be increased to compensate
for area taken up by louvers.
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.
Venting
For maximum efficiency and minimum lint
accumulation, tumbler air must be exhausted to the
outdoors by the shortest possible route.
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 flexible ducts.
Use exhaust ducts made of sheet metal or other
noncombustible material. Use duct tape or pop-rivets
on all seams and joints.
Verify that old ducts are thoroughly cleaned out before
installing new tumbler.
NOTE: Exhaust ducts shall be constructed of sheet
metal or other noncombustible material. Such
ducts must be equivalent in strength and corrosion
resistance to ducts made of galvanized sheet steel
not less than 0.0195 inches (0.495 mm) thick.
Where the exhaust duct pierces a combustible wall,
ceiling, floor or partition the opening must be sized per
local codes. The space around the duct may be sealed
with noncombustible material. Refer to
Figure 9.
IMPORTANT: For best performance provide an
individual exhaust duct for each tumbler. Do not
install a hot water heater in room containing
tumblers. It is better to have the water heater in a
separate room with a separate air inlet.
A drying tumbler produces combustible
lint. To reduce the risk of fire, the tumbler
must be exhausted to the outdoors.
W057
To reduce the risk of fire and accumulation
of combustible gases, DO NOT exhaust
tumbler 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 space of a
building.
W059
WARNING
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
increased fire hazard.
W355
WARNING