Page 19
Dryer Installation with Multiple Exhaust
For Exhaust Duct more than 14 feet (5 m) and 2 elbows
equivalent and more than 0.3 inches (8 mm) static pressure.
(See illustration on page 21.)
1. Make-up air from outside building may enter enclosure from
top or side walls. (See Dryer Make-Up Air Requirements
Chart)
2. Use constant diameter duct with area equal to the sum of
dryer duct areas.
EXAMPLE: Six 8 inch (204 mm) diameter duct = one
19.6 inch (498 mm) diameter duct in area. Use 20 inch
(508 mm) 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
(6.3 kcal/hr) for each cubic foot per minute (cfm) used.
4. Zero inches clearance to combustible material allowed on sides
and at points within 4 inches (102 mm) of front on top.
5. Heat loss into laundry room from dryer fronts only is about
60 Btu/hr per square foot (15 kcal/hr per 0.1m²).
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 previous
page. Must meet local electrical codes. Fan air flow (cfm)
(m³/min.) 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
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