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For Exhaust Duct more than 14 feet and 2 elbows equivalent and
more than 0.3 inches static pressure.
1. Make-up air from outside building may enter enclosure from
top or side walls. Area of opening should be equal to 4-6
times the sum of dryer duct areas. Provide 1 sq. ft. for each 6
in. diameter; 2 sq. ft. for each 8 in. diameter; and 4 sq. ft. for
each 12 in. diameter.
2. Use constant diameter duct with area equal to the sum of dryer
duct areas.
EXAMPLE: 6-8 in. diameter duct = 1-19.6 in. diameter duct
in area. Use 20 in. diameter duct or diameter to match tube-
axial fan.
3. Enclosure (plenum) with service door. This separates the
dryer air from room comfort air. If dryers use room air instead
of outside air, the heat loss can be another 25 BTU/HR for
each cubic foot per minute (CFM) used.
EXAMPLE: 110 lb. dryer, 2000 CFM = 50,000
BTU/HR loss.
4. Zero inches clearance to combustible material allowed on
sides and at points within 4 inches of front on top.
5. Heat loss into laundry room from dryer fronts only is about 60
BTU/HR per square foot.
6. Flange mounted, belt driven tube-axial fan. Fan must run
when one or more dryers are running. See suggested
Automatic Electrical Control Wiring Diagram on page 23.
Must meet local electrical codes. Fan air flow (CFM) is equal
to sum of dryer air flows, but static pressure (SP) is dependent
on length of pipe and number of elbows.
7. Barometric Bypass Damper—Adjust to closed flutter
position with all dryers and exhaust fan running. Must be
located within enclosure.
CAUTION
Never install hot water heaters or other gas appliances in the
same room as dryers. Never install cooling exhaust fans in the
same room as dryers.
CAUTION
Never exhaust dryers with other types of equipment.
Dryer Installation with Multiple Exhaust
EXHAUST
INSTALLATION—
MULTIPLE MANIFOLD
DUCT