American Dryer Corp. AD-385 - Manual (Page 15)

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 front 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. As a general rule, an unrestricted air
entrance from the outdoors (atmosphere) of a minimum of 1-1/2 square feet is required for each
dryer. 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 (33%). It is not necessary to have a sepa­
rate 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 (8) dryers, two (2) unrestricted openings measuring 2 feet by
3 feet (6 square feet each) is acceptable.
1
2‘
)
MAKE UP AIR OPENINGS
2'
1
— 3'^
TYPICAL INSTALLATION SHOWING MAKE - UP AIR OPENINGS
11