Make-Up Air - Alliance Laundry Systems JT30XG Manual De Instalación, Operación, Mantenimiento Y Seguridad

• Collector Venting
While it is preferable to exhaust tumblers individually
to the outdoors, a main collector duct may be used if it
is sized according 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, as shown in Figure
5. The individual tumbler ducts must enter the
collector duct at a 45° angle in the direction of air flow.
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) for Each Tumbler
Model
30#
50#
75EG
75EG
634
120#
170#
M414670
© Published by permission of the copyright owner – DO NOT COPY or TRANSMIT
Opening
2 2
Inches (cm )
144 (928)
195 (1258)
250 (1613)
300 (1936)
free air
395 (2548)
free air
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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