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(See illustration on next page.) 1. Make-up air from outside building may enter enclosure from top or side walls. Area of opening should be equal to 4 to 6 times the sum of dryer duct areas. Provide 1 square foot (.1m.) for each 6 inches (15.24 cm) diameter; 2 square feet (.2m.) for each 8 inches (20.3 cm) diameter; and 4 square feet (.4m.) for each 12 inches (30.5 cm) diameter. 2. Use constant diameter duct with area equal to the sum of dryer duct areas. EXAMPLE: 6-8 inches (20 cm) diameter duct = 1-19.6 inches (49.8 cm) diameter duct in area. Use 20 inches (50 cm) 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 (100 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 0.1m.). 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) (M./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. Page 24 Dryer Installation With Separate Exhaust (Preferred) DRYER INSTALLATION WITH SEPARATE EXHAUST (PREFERRED) For ductwork less than 14 feet and 2 elbows equivalent and less than 0.3 inches static pressure: NEVER exhaust the dryer into a chimney. NEVER install wire mesh screen over the exhaust or make-up 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. The area of the opening should be equal to 4 to 6 times the sum of the dryer duct areas. Provide 1 square foot (.1m.) for each 6 inches (15.24 cm) diameter; 2 square feet (.2m.) for each 8 inches (20.3 cm) diameter; and 4 square feet (.4m.) for each 12 inches (30.5 cm) 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, additional heat loss can be another 25 BTU/HR (6.3 kcal/hr) for each cubic foot per minute (CFM) (.03m./min.) used. 3. Zero inches (mm) clearance to combustible material allowed on sides and at points within 4 inches (100 mm) of front on top. 4. Heat loss into laundry room from dryer front panels is about 60 BTU/ HR per square foot (15 kcal/hr per 0.1m.). Page 25 Exhaust and Venting 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 (4.3 mm) of straight duct and maximum of two 90° bends. 2. Use 45° and 30° elbows wherever possible. 3. Exhaust each dryer separately. 4. Use 2 feet (0.6 m) of straight duct on dryer before installing an elbow on Energy-Saver models only. 5. Do not install wire mesh or other restrictions in the exhaust duct. 6. Use clean-outs in the exhaust duct and clean periodically when needed. 7. Never exceed 0.3 inches (7.6 mm) water column static pressure in the exhaust duct. 8. Inside surface of the duct must be smooth. 9. Recommend pop rivets for duct assembly. FOR BEST DRYING: 1. Provide opening to the out-of-doors in accordance with the following: For each dryer— 6 inches (15 cm) diameter exhaust requires a 1 square feet (0.1 m.) opening for make-up air. 8 inches (20 cm) diameter exhaust requires a 2 square feet (0.2 m.)opening for make-up air. 12 inches (30 cm) diameter exhaust requires a 4 square feet (0....

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