Miele PT 7136 PLUS installation manual Tips about the ductwork

Installation of exhaust venting

Tips about the ductwork

–Check with your local building codes to determine the maximum allowable duct length.

–Only use rigid or flexible metal duct for exhausting. Non-metallic flexible hose should not be used, it is a potential fire hazard.

–In the United Stated foil-type flexible ducts should only be used if identified for use by the manufacturer as compliant with the Outline for Clothes Dryer Transition Duct, Subject ANSI/UL 2158A.

In Canada, only flexible metal (foil-type) ducts specifically identified for use by the manufacturer should be used.

–Use the wall vent or window connection (optional accessories) for venting outdoors.

–For optimal drying results avoid long ducting with too many bends, angles or tight corners.

–Do not assemble the duct with screws or other fastening devices that extend into the duct and catch lint.

–The shorter the exhaust ductwork, the more efficient the dryer will be. Expelled air is slowed down in the ducts due to friction against the inner walls. The shorter and smoother the inner walls are, the less friction will be created.

–An elbow or bend creates more friction than a straight duct. An additional duct length factor must be added for each elbow or bend (see Table). This factor expresses the resistance of the bend in terms of a straight length of duct.

The additional length factor is then added to the existing duct to give the effective length.

A larger duct diameter helps reduce friction. Therefore the duct diameter and length should be increased simultaneously.

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