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Installation
2:4
wherever possible. All ductwork should be smooth inside with no projections from sheet metal
screws or other obstructions, which will result in lint accumulation. Duct sections must be oriented
for proper airow (consult duct supplier) and all joints must be taped to prevent moisture and lint
from escaping. Inspection doors should be installed at strategic points in the exhaust ductwork for
periodic inspection and cleaning of lint from the ductwork.
IMPORTANT
• It is recommended that exhaust or booster fans not be used in the exhaust ductwork system.
If an exhaust booster fan is required, care must be taken to meet all other installation
requirements.
• Exhaust back pressure measured by a manometer must be no less than 0 and must not exceed
0.6 in WC (1.5 mb).
• Do not obstruct the ow of makeup and exhaust air.
• Check backdraft dampers in the exhaust ductwork. Inspect and remove any lint accumulation,
which can cause the damper to bind or stick.
• A back-draft damper that is sticking partially closed can result in slow drying and shutdown of
the machine due to activation of a high limit thermostat.
IMPORTANT
When the exhaust ductwork passes through a wall, ceiling, or roof, installation must comply with
applicable local and national codes.
Refer to the National Fuel Gas Code and applicable local codes for ducting requirements.
Outside Ductwork Protection
To protect the outside end of the horizontal ductwork from the weather, a 90° elbow bent downward
should be installed where the exhaust exits the building. If the ductwork travels vertically up
through the roof, it should be protected from the weather by using a 180° turn to point the opening
downward. In either case, allow at least twice the diameter of the duct between the duct opening
and the nearest obstruction.
IMPORTANT
Do not use screens, louvers, or caps on the outside opening of the exhaust ductwork.
Single Dryer Venting
IMPORTANT
For extended ductwork runs, the cross-sectional area of the ductwork can only be increased to an
extent. When the ductwork approaches the maximum limits as noted in this manual, a professional
HVAC rm should be consulted for proper venting design.
Horizontal Venting
If the dryer is installed using horizontal dryer venting, the overall length of the ductwork from
the dryer to the outside exhaust outlet, must not exceed 20 feet (6 meters). The diameter of this
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