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Dryer Enclosure Requirements ______
Even though a 12-inch (30.48 cm) clearance is acceptable,
it is recommended that the rear of the dryer be positioned
approximately 24-inches (60.96 cm) from the nearest
obstruction (i.e., wall) for ease of installation, maintenance,
and service. Bulkheads and partitions should be made from
noncombustible materials. The clearance between the
bulkhead header and the dryer must be a minimum of
4-inches (10.16 cm) and must not extend more than 4-inches
(10.16 cm) to the rear of the front. A 2-inch (5.08 cm)
clearance is required between the bulkhead facing and the
top of the dryer.
Air supply (make-up air) must be given careful consideration
to assure proper performance of each dryer. As a general
rule, an unrestricted air entrance from the outdoors
(atmosphere) of a minimum of 1.4 feet
2
(0.13 meters
2
) is
required for each dryer. (Based on 1 inch
2
per 1,000 Btu.)
To compensate for the use of registers or louvers used over
the openings, this make-up air must be increased by
approximately thirty-three percent. Make-up air openings
should not be located in an area directly near where exhaust
vents exit the building.
NOTE:
Bulkhead facing should not be installed until after
the dryer is in place. Ceiling area must be located a
minimum of 12-inches (30.48 cm) above the dryer top
console (module) and 18-inches (45.72 cm) for steam
models.
When fire sprinkler systems are located above the dryers,
a minimum of 18-inches (45.72 cm) above the dryer
console (module) is required. Dryers may be positioned
sidewall to sidewall, however, 1 or 2-inches (2.54 or 5.08
cm) is suggested for ease of installation and
maintenance. Allowances must be made for the opening
and closing of the control door and the lint door.
Fresh Air Supply Requirements ______
This appliance may only be installed in a room that meets
the appropriate ventilation requirements specified in the
national installation regulations.
When the dryer is operating, it draws in room air, heats it,
passes this air through the tumbler, 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 drying efficiency will be
adversely affected. Ignition problems and sail switch
“fluttering” problems may result, as well as premature motor
failure from overheating. The dryer must be installed with
provisions for adequate combustion and make-up air supply.
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.
Example: For a bank of four dryers, two unrestricted
openings measuring 27.7-inches by 30-inches (70.358 cm
by 76.2 cm), (11.5 feet
2
[1.068385 meters
2
]) are acceptable.
Allowances must be made for remote or constricting
passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.
A = 27.7-inches (70.358 cm)
B = 30-inches (76.2 cm)
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