Dryer Installation with Multiple Exhaust

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 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

19.6inch (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/h (6.3 kcal/h) 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/h per square foot (15 kcal/h 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 .

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