Alliance Laundry Systems T433I Exhaust Requirements, Layout, Venting, Make-UpAir, Example: A tumbler with a rated input of, 120,000 Btu/hour requires 120 square inches of free opening

Exhaust Requirements

WARNING

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

Layout

Wherever possible, install tumblers along an outside wall, where duct length can be kept to a minimum and makeup air can be easily accessed. Construction must not block the airflow at the top rear of the tumbler. Doing so would prevent adequate air supply to the tumbler combustion chamber.

Make-Up Air

A tumbler is forced air exhausted and requires provisions for make-up air to replace air exhausted by tumbler. Refer to Table 4.

IMPORTANT: Do not obstruct flow of combustion and ventilation air.

Required Make-Up Air Opening (to the outside) for Each Tumbler

Models	Opening

120 Pound	360 in2 (2323 cm2)
	free air

170 Pound	575 in2 (3710 cm2)
	free air

Table 4

At a minimum, the National Fuel Gas Code requires tumblers to have at least 1 square inch (6.5 square cm) of opening for every 1000 Btu/hour of input rating for proper combustion.

Example: A tumbler with a rated input of120,000 Btu/hour requires 120 square inches of free opening.

The additional opening recommended by the manufacturer is required for optimum drying and reliability.

Louvers in opening to outdoors will reduce airflow. Opening must compensate for area taken up by louvers.

Make-up air openings in rooms 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 between tumbler(s) and make-up air openings. If it is necessary to duct make-up air to tumbler(s), increase area of duct work by 25% to compensate for any restriction in air movement.

Venting

For maximum efficiency and minimum lint accumulation, tumbler 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 sheet metal screws to joint vent sections.

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