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1. Make-up air from outside building may enter enclosure fromtop or side walls. Area of opening should be equal to 4-6times the sum of dryer duct areas. Provide 1 sq. ft. for each 6in. diameter; 2 sq. ft. for each 8 in. diameter; and 4 sq. ft. foreach 12 in. diameter. 2. Use constant diameter duct with area equal to the sum of dryerduct 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 thedryer air from room comfort air. If dryers use room air insteadof outside air, the heat loss can be another 25 BTU/HR foreach 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 suggestedAutomatic Electrical Control Wiring Diagram on page 23. Must meet local electrical codes. Fan air flow (CFM) is equalto sum of dryer air flows, but static pressure (SP) is dependenton 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 thesame room as dryers.Never install cooling exhaust fans in thesame room as dryers. CAUTION Never exhaust dryers with other types of equipment. Page 26 Dryer Installation with Separate Exhaust (Preferred) (Illustration) DRYER INSTALLATION WITH SEPARATE EXHAUST (PREFERRED) DRYER INSTALLATION WITH SEPARATE EXHAUST (PREFERRED) For Exhaust Duct less than 14 feet and 2 elbows equivalent andless than 0.3 inches static pressure. NEVER exhaust the dryer into a chimney. NEVER install wire mesh screen over the exhaust or makeup air area. NEVER exhaust into a wall, ceiling, or concealed space. 1. Make-up air opening from outside the building may enter the enclosure from the 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. Enclosure (plenum) with service door. This separates the dryer air from the 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: A 110 lb. dryer with 2000 CFM = heat loss of 50,000 BTU/HR. 3. Zero inches clearance to combustible material allowed on sides and at points within 4 inches of front on top. 4. Heat loss into laundry room from dryer fronts only is about 60 BTU/HR per square foot. Page 27 Dryer Air Flow Installation DRYER AIR FLOW INSTALLATION EXHAUSTING DUCT MAKE-UP AIR OTHER RECOMMENDATIONS TROUBLESHOOTING Nothing is more important than air flow for the proper operation of a clothes dryer. A dryer is a pump which draws make-up air from the out-of-doors, through the heater, through the clothes and then forces the air through the exhaust duct back to the out-of-doors. Just as in a fluid water pump, there must be a fluid air flow to the inlet of the dryer, if there is to be the proper fluid air flow out of the exhaust duct. In summary, there must be the proper size out-of-doors inlet air opening (4-6 times the combined areas of the air outlet) and an exhaust duct, size and length of which allows flow through the dryer with no more than 0.3 inches water column static pressure in the exhaust duct. In some instances, special fans are required to supply make-up air, and/or boost exhaust fans are required for both regular and energy saving models. FOR BEST DRYING: 1. Exhaust duct maximum length 14 feet of straight duct and maximum of two 90° bends. 2. Use 45° and 30° elbows whe...

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