CopperSmith CSPI-422 Kurulum Talimatları Kılavuzu - Sayfa 10

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Duct Pipe and Fitting Sizes (Continued)

Duct Runs – Length

a. Configure the ventilation duct run to be as short and as direct to the outside as possible. Minimize the

number of elbows and transition fittings used. Complex or long runs should be reviewed by a qualified

installer.

b. No portion of the ducting should be run so that the exhaust air flows downward. Since exhaust heat

rises, forcing the air to flow downward will cause increased static pressure. As previously mentioned,

improperly installed duct pipe will cause excessive static pressure (air resistance), that may result in

rattling, vibration and air buffeting noises, as well as inadequate ventilation.

c. Duct runs for 290 & 390 CFM ventilator models should not exceed 20 linear feet with two 90-degree

elbows (or four 45-degree elbows), a damper and a roof or wall cap. Longer runs or additional elbows

will result in decreased ventilation performance. Each 90-degree elbow is the equivalent of 8 linear

feet of duct pipe; each 45-degree elbow is equivalent to 4 linear feet of duct pipe.

d. Duct runs for 600 & 1200 CFM ventilator models should not exceed 35 linear feet with two 90-degree

elbows and two 45-degree elbows, a damper and a roof or wall cap. Longer runs or additional elbows

will result in decreased ventilation performance. Each 90-degree elbow is the equivalent of 6 linear

feet of duct pipe; each 45-degree elbow is equivalent to 3 linear feet of duct pipe.

e. Always run ventilator ducts to the outdoors. DO NOT terminate a duct into an attic, basement, garage,

crawl space under a house, a chimney, other ducting or an enclosed room.

4. Dampers

IMPORTANT: DO NOT USE SCREWS TO ATTACH ANY TYPE OF DAMPER AS THE SCREWS MAY BLOCK

IMPORTANT: DO NOT USE MORE THAN ONE DAMPER IN THE VENTILATION SYSTEM. NOTE: Many styles

Always use carefully crafted, tightly wrapped aluminum foil metal duct tape on all connections and physically

view and test the damper blades to make certain they are opening and closing correctly. Make sure that the

damper blades do not touch the duct walls and that there is no debris blocking the free movement of the

damper mechanism. Common things to look for include screws protruding into the blade's path, overspray of

paint, plaster and insulation. If using rectangular duct, be sure that all four sides of the duct are on the outside

of the damper's start collar or frame.

Revised 05/15/20

THE DAMPER BLADES.

of roof caps and wall caps have built-in dampers. See Roof Caps and Wall Caps section for more

detail.