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NOTE: When fire sprinkler systems are located above the dryers, a minimum of 18-inches above the
dryer console (module) is suggested. Dryers may be positioned side wall to side wall however,
1 or 2 inches is suggested between dryers (or wall) for ease of installation and maintenance.
Allowances must be made for the opening and closing of the control and lint doors.
D. FRESH AIR SUPPLY
When the dryer is operating, it draws in room air, heats it, passes this air through the basket (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.
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 2,100 cfm (cubic feet per minute) must be
supplied to each gas dryer and electric dryer with a 72 Kw oven, 1,700 cfm to each electric dryer with a 60 Kw
oven, 2,420 cfm to each electric dryer with a 80 Kw oven, and 2,750 cfm for each steam dryer. As a general rule,
an unrestricted air entrance from the outdoors (atmosphere) of a minimum of three (3) square feet is required for
each gas dryer and 72 Kw electric dryer and a minimum of five (5) square feet 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 (33) percent. 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.
EXAMPLE: For a bank of six (6) gas dryers, two (2) openings measuring 3 feet by 3 feet
(9 square feet) is acceptable.
Allowances must be made for remote or constricting passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.