INSTALLATION INSTRUCTIONS
For best drying results, avoid extra long ducting with too many bends or angles. Avoid ducting in tight corners.
Use flexible metal pipe or rigid metal pipe for venting.
The shorter the exhaust ductwork, the more efficient the dryer will be. Ex- pelled 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 that will be created.
An elbow or bend creates more friction than a straight duct. An additional duct length factor must therefore be added for each elbow or bend (see Table 1.)
This factor expresses the restistance of the bend in terms of a straight length of duct.
The additional length factor is then added to the measured duct length to give the effective duct length.
A larger duct diameter helps to reduce friction. The duct diameter should therefore be increased with increasing duct length.
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