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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
26 gauge (0.0195-inches [0.50 mm]) thick.”
2. Single Dryer Venting
When possible, it is suggested to provide a separate exhaust duct for each dryer. The exhaust ductwork
should
be
laid out in such a way that the ductwork travels as directly as possible to the outdoors with as few turns as
possible. It is suggested that the use of 90º turns in ducting be avoided; use 30º or 45º angles instead. The shape
of the exhaust ductwork is not critical so long as the minimum cross-sectional area is provided.
NOTE:
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) water column (W.C.).
It is suggested that the ductwork from each dryer not exceed the limitations noted in this manual. If the
ductwork exceeds these limitations or has numerous elbows, the cross-sectional area of the ductwork
must be
increased in proportion to length or number of elbows in it.
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 heating, venting, and air conditioning (HVAC) firm
should be
consulted for proper venting information.
The ductwork
should be
smooth inside with no projections from sheet metal screws or other obstructions,
which will collect lint. When adding ducts, the duct to be added should overlap the duct to which it is to be
connected.
ALL
ductwork joints
must be
taped to prevent moisture and lint from escaping into the building.
Also, inspection doors
should be
installed at strategic points in the exhaust ductwork for periodic inspection
and cleaning.
NOTE:
When the exhaust ductwork passes through a wall, ceiling, or roof made of combustible
materials, the opening
must be
2-inches (5.08 cm) larger than the duct (all the way around).
The duct
must be
centered within this opening.
To protect the outside end of the horizontal ductwork from the weather, a 90º elbow bent downward
should be
installed where the exhaust exits the building. If the exhaust ductwork travels vertically up through the roof, it
should be
protected from the weather by using a 180º turn to point the opening downward. In either case, allow
at least twice the diameter of the duct between the duct opening and nearest obstruction.
IMPORTANT:
DO NOT
use screens, louvers, or caps on the outside opening of the exhaust
ductwork.
NOTE:
Содержание AD-320
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