Domestic Type I (T20, T30, T50 Only)
A = 6-inches (15.24 cm) |
B = 24-inches (60.96 cm) |
EXAMPLE: For T50, 2 unrestricted openings measuring 6-inches by 24-inches (15.24 cm by 60.96 cm) are acceptable.
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 130 inch2 (838.708 cm2) for T20; 179 inch2 (1154.836 cm2) for T30; and 293 inch2 (1890.319 cm2) for T50. 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 _______
When the dryer is operating, it draws in room air, heats it, passes this air through the tumbler, and exhausts it out of the building. Therefore, the room air must be continually replenished from the outdoors. If the make-up air is inadequate, drying time and drying efficiency will be adversely affected. Ignition problems and sail switch “fluttering” problems may result, as well as premature motor failure from overheating. The dryer must be installed with provisions for adequate combustion and make-up air supply.
Air supply (make-up air) must be given careful consideration to ensure proper performance of each dryer. As a general rule, an unrestricted air entrance from the outdoors of 110 inch2 (710 cm2) is required for each T75, 90 inch2 (580 cm2) for each T50, 55 inch2 (354 cm2) for each T30, and 40 inch2 (258 cm2) for each T20. (Based on 1 inch2 [6.5 cm2] per 1,000 Btu [252 kcal].)
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 all the dryers.
To compensate for the use of registers or louvers used over the openings, this area must be increased by approximately 33%. 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 high altitudes or predominantly low pressure areas.
Note
!Component failure due to dry cleaning solvent fumes will void the warranty.
A = 10-inches (25.4 cm)
B = 11-inches (27.94 cm)
EXAMPLE: For a bank of 4 T30 dryers, 2 unrestricted openings measuring 10-inches by 11-inches (25.4 cm by 27.94 cm) are acceptable.
Important
!Make-up air must be 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.
Exhaust Requirements________________
Exhaust ductwork should be designed and installed by a qualified professional. Improperly sized ductwork will create excessive back pressure, which results in slow drying, increased use of energy, and shutdown of the burner by the airflow (sail) switch, burner hi-limits, or lint chamber hi-limit protector thermostat. The dryer must be installed with a proper exhaust duct connection to the outside.
The dryer shall not be exhausted into any gas vent, chimney, wall, ceiling or concealed space of a building.
Caution
!This dryer produces combustible lint and must be exhausted to the outdoors.
Improperly sized or installed exhaust ductwork can create a potential fire hazard.
The 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. There should be a minimum 6-inch (15.24 cm) clearance between the back guard and the first bend in the ductwork for ease of servicing. Single or independent dryer venting is recommended. It is suggested that the use of 90° turns be avoided; use 30° and/or 45° bends instead. The radius of the elbows should preferably be 1-1/2 times the diameter of the duct. All ductwork should be smooth inside with no projections from sheet metal screws or other obstructions, which will collect lint. When adding ducts, overlap the duct being connected. All ductwork joints must be taped to prevent moisture and lint from escaping into the building. Back draft dampers must be installed in all commonly ducted systems. 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.
