IPSO 170 ユーザーズマニュアル

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4-08-45

11

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.

A tumbler is forced air exhausted and requires 

provisions for make-up air to replace the air exhausted 

by the tumbler. 

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:

Table 1 

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.

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 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 code.
Verify that old ducts are thoroughly cleaned out before 

installing new tumbler(s).

360 in.

2

 (2323 cm

2

)

525 in.

2

 (3710 cm

2

)

W057

W059

W749

W355