VERTICAL VENTING
Illus. D
MULTIPLE DRYER VENTING (VERTICAL)
The maximum length of venting from the last dryer to where it exhausts:
Vertical venting must not exceed 25 feet (7.62 meters) – this calculation compensates for the use of a maximum of three (3) elbows, including the two (2) elbows creating the 180° (turned downward) outside outlet protection.
IMPORTANT: No more than four (4) dryers maximum should be connected to one (1) main common duct with a vertical run.
NOTE: Distance between dryer single ducts being connected to the main common duct must be a minimum of
Ductwork should be laid out in such a manner where allowances are made at rear area of the dryer for removal of rear service panels or guards.
Illus. D shows the minimum cross section area for vertical multiple dryer venting. These figures must be increased in proportion if the main duct run from the last dryer to where it exhausts has numerous elbows or is unusually long.
IMPORTANT: For extended ductwork runs the cross section area of the duct can only be increased to an extent. For extended ductwork runs a professional heating, ventilating, and
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