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IMPORTANT: Minimum duct size for dryer is 10-inches (25.40 cm) round duct. Duct size must not
be reduced anywhere downstream of dryer.
IMPORTANT: It is recommended that exhaust or booster fans not be used in the exhaust ductwork
system.
NOTE: As per the National Fuel Gas Code, “Exhaust ducts for type 2 clothes dryers shall be
constructed of sheet metal or other noncombustible material. Such ducts shall be equivalent in
strength and corrosion resistance to ducts made of galvanized sheet steel not less than
0.0195-inches (26 gauge [0.05 mm]) thick.”
2. Venting Layout
a. Single Dryer Venting
When single dryer venting is used for horizontal or vertical venting, the minimum duct size is 10-inches
(25.40 cm) in diameter and the ductwork from the dryer to the outside exhaust outlet must not exceed
a distance and the number of elbows (including both connection to dryer and outside protection shown
in the illustration below).
IMPORTANT: Exhaust back pressure measured by a manometer at the dryer exhaust duct area must
be no less than 0 and must not exceed 0.3 inches (0.74 mb) of water column (W.C.).
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCTWORK CAN
CREATE A POTENTIAL FIRE HAZARD.