American Dryer Corp. SL20 - Manual (Page 7)

113191-2 5
Important
Make-up air must be provided from a source free of
dry cleaning solvent fumes. Make-up air that is
contaminated by dry cleaning solvent fumes will result in
irreparable damage to the motors and other dryer
components.
Note
Component failure due to dry cleaning solvent fumes
will void the warranty.
Exhaust Requirements _________________
Do not use a nonmetal flexible vent or a metal vent that is
smaller than 4-inches (10.2 cm) in diameter or exhaust hoods
with magnetic latches.
The dryer shall not be exhausted into any gas vent, chimney,
wall, ceiling or concealed space of a building.
Do not install flexible vent in enclosed walls, ceilings, or floors.
Important
Observe all governing codes and ordinances.
Exhaust your dryer to the outside. Moisture and lint indoors
may cause:
• Lint to gather around the dryer where it can be fuel for a
fire.
• Moisture damage to woodwork, furniture, paint, wallpaper,
carpet, etc.
• Housecleaning problems and health problems.
A 4-inch (10.2 cm) diameter vent is required. A rigid or flexible
metal vent must be used. Do not use a plastic or a foil covered
vent.
Use a heavy metal vent. Do not use a plastic or metal foil
vent. A rigid metal vent is recommended to prevent crushing
and kinking. A flexible metal vent must be fully extended and
supported when the dryer is in its final position. Remove
excess flexible vent to avoid sagging and kinking that may
result in reduced airflow.
If using an existing exhaust system, clean lint from entire
length of system. Make sure exhaust hood is not plugged
with lint. Replace any vinyl or metallized plastic foil vent with
rigid metal or flexible metal vent.
Use duct tape to seal all joints. Do not use screws or other
fastening devices that extend into the interior of the vent to
secure vent.
Service check: Back pressure in any exhaust system used
must be no less than 0 and must not exceed 0.6 inches
(1.49 mb) water column (W.C.) measured with an incline
manometer at the point that exhaust vent connects to the
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
m a d e o f g a l v a n i z e d s h e e t s t e e l n o t l e s s t h a n
0.0195-inches (26 gauge [0.05 mm]) thick.”
If a closet door is installed: unobstructed air openings are
required. The air openings shall be located 3-inches
(7.62 cm) from the lower opening (above floor level) and upper
opening (below ceiling). The total free area of the air openings
in the door shall not be less than 96 square inches
(619.35 square centimeters). Louvered doors with equivalent
air openings are acceptable.
No other fuel-burning appliance shall be installed in the
same closet as the dryer.
Fresh Air Supply Requirements ________
The air supply (make-up air) must be given careful
consideration to ensure proper performance of each dryer.
An unrestricted source of air is necessary for each dryer. As
a general rule, an unrestricted air entrance from the outdoors
(atmosphere) of a minimum of 1/3 square feet (0.031 square
meters) is required for each dryer. If registers or louvers are
installed over the openings, then the area must be increased.
It is not necessary to have a separate make-up air opening
for each dryer. Common make-up air openings are
acceptable. However, they must be set up in such a manner
that the make-up air is distributed equally to the dryers. The
dryer must be installed with provisions for adequate
combustion and make-up air supply.
EXAMPLE: For a bank of eight (8) dryers, two (2)
unrestricted openings measuring 1 foot by 1 foot (0.31
meters by 0.31 meters), (1 square foot [0.93 square
meters]) are acceptable.
Important
Make-up air openings should not be located in an
area directly near where exhaust vents exit the
building.
Allowances must be made for remote or constricting
passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.
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