Alliance Laundry Systems 000 BTU, 105, 250 C.F.M, 80 MAKE-UPAIR, •Collector Venting, IMPORTANT: Do not obstruct the flow of combustion and ventilation air

•Collector Venting

While it is preferable to exhaust tumblers individually to the outdoors, a main collector duct may be used if it is sized accordingly. Refer to Figure 5. This illustration indicates minimum diameters, and should be increased if the collector length exceeds 20 feet (6.1 m). The collector duct may be rectangular in cross section, as long as the area is not reduced. Provisions should be made for lint removal and cleaning of the collector duct.

The collector duct must be tapered. Refer to Figure 5. The individual tumbler ducts must enter the collector duct at a 45° angle in the direction of airflow. Never connect a tumbler duct at a 90° angle to the collector duct. Doing so will cause excessive back pressure, resulting in poor performance. Never connect two tumbler exhaust ducts directly across from each other at the point of entry to the collector duct.

The collector system must be designed so the static back pressure measured 12 inches (30.5 cm) from the exhaust thimble does not exceed the maximum allowable pressure specified on the installation sticker on the rear of the tumbler. This must be measured with all tumblers running that are vented into the collector.

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.

Recommended make-up air opening to the outside is 144 inches2 (928 cm2).

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

Example: A tumbler with a rated input of 120,000 BTU/hr. requires 120 square inches of free opening.

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

Protective louvers in the opening to the outdoors can reduce air movement by approximately 40 percent. The opening must compensate for the area taken up by the louvers.

The 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 duct work by 25 percent to compensate for any restriction in air movement.

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