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B. FRESH AIR SUPPLY REQUIREMENTS
When the dryer is operating, it draws in room air, heats it, passes this air through the tumbler (basket), and
exhausts it out of the building. Therefore, the room air
must be
continually replenished from the outdoors. If
the make-up air is inadequate, drying time and efficiency will be adversely affected. Ignition problems and sail
switch fluttering problems may result, as well as premature motor failure from overheating.
Air supply (make-up air)
must be
given careful consideration to assure proper performance of each dryer. An
unrestricted source of air is necessary for each dryer. An airflow of 9,200 cfm (cubic feet per minute) - 260.52
cmm (cubic meters per minute) -
must be
supplied to each gas dryer and 12,000 cfm (cubic feet per minute) -
339.80 cmm
must be
supplied to each steam dryer. As a general rule, an unrestricted air entrance from the
outdoors (atmosphere) of a minimum of 12 square feet (1.15 square meters) is required for each gas dryer and a
minimum of 14 square feet (1.30 square meters) is required for each steam dryer.
To compensate for the use of registers or louvers used over the openings, this make-up air area
must be
increased
by approximately thirty-three percent (33%). Make-up air openings
should not be
located in an area directly
near where exhaust vents exit the building.
It is not necessary to have a separate make-up air opening for each dryer. Common make-up air openings are
acceptable. However, they
must be
set up in such a manner that the make-up air is distributed equally to
ALL
the dryers.
Allowances
must be
made for remote or constricting passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.
IMPORTANT:
Make-up air
must be
provided from a source free of dry cleaning solvents
fumes. Make-up air that is contaminated by dry cleaning solvent fumes will
result in irreparable damage to the motors and other dryer components.
NOTE:
Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.
1. Optional Inlet Air Adapter
The MLG-410 dryer may be built with the inlet air adapter option. This option allows
ALL
of the dryers
inlet air to be ducted from the outdoors directly to the dryer.
This option consists of a sheet metal box located on top of the dryer with two (2) 30-inch (76.2 cm)
diameter duct collars on top. (Refer to the
illustration
on
page 22
for the location and dimensions of the
inlet air adapter.)
Use two (2) 30-inch (76.2 cm) diameter flexible hoses to connect the 30-inch (76.2 cm) collars to the
outdoors. Allow enough slack in the flexible hoses so that the dryer can tilt, without restriction.
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