14
It is not necessary to have separate make-up air openings 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
ALL
the dryers.
EXAMPLE:
For a bank of four (4) dryers, two (2) unrestricted openings measuring 2 feet by 2-1/2 feet
(0.61 meters by 0.76 meters) - 10 square feet (0.93 square meters) - is acceptable.
Allowances
must be
made for remote or constricting passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.
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.
E. EXHAUST REQUIREMENTS
1. General Exhaust Duct Work Information
Exhaust duct work
should be
designed and installed by a qualified professional. Improperly sized duct
work will create excessive back pressure which results in slow drying, increased use of energy, overheating
of the dryer, and shut down of the burner by the airflow (sail) switches, burner hi-limits, or basket (tumbler)
hi-heat thermostats.
CAUTION:
DRYER
MUST BE
EXHAUSTED TO THE OUTDOORS.
CAUTION: IMPROPERLY
SIZED
or
INSTALLED
EXHAUST
DUCT
WORK
CAN
CREATE
A
POTENTIAL
FIRE
HAZARD.
The duct work
should be
laid out in such a way that the duct work travels as directly as possible to the
outdoors with as few turns as possible. Single or independent dryer venting is recommended.
When single drying venting is used the length of duct work from the dryer to the outside exhaust outlet
should not
exceed
15 feet (4.57 meters). The minimum diameter of this duct work
must be
at least
14-inches (35.56 cm). In the case of multiple (common) dryer venting, the distance from the last dryer to
the outside exhaust outlet
should not
exceed
15 feet (4.57 meters). The shape of the duct work is not
critical so long as the minimum cross-sectional area is provided. It is suggested that the use of 90° turns be
avoided; use 30° and/or 45° angles instead. The radius of the elbows
should preferably be
1-1/2 times the
diameter of the duct. Including basket (tumbler) and dryer elbow connections or elbows used for outside
protection from the weather, no more than two (2) elbows
should be
used in the exhaust duct run. If more
than two (2) elbows are used, the cross-sectional area of the duct work
must be
increased.
ALL
duct
work
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
duct work joints
must be
taped to prevent moisture and lint from escaping into the building. Inspection
door
should be
installed at strategic points in the exhaust duct work for periodic inspection and clean-out of
lint from the duct work.
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