All dimensions based on net free area in square inches. Metal louvers or screens reduce the free area of a combustion air opening
aminimum of approximately 25%. Check with louver manufacturers for exact net free area of louvers. Where two openings are provided, one must be within 12" (30 cm) of the ceiling and one must be within 12" (30 cm) of the floor of the mechanical room. Each opening must have net free area as specified in Table - B. Single openings shall commence within 12" (30 cm) of the ceiling.
The combustion air supply must be completely free of any flammable vapors that may ignite or chemical fumes which may be corrosive to the appliance. Common corrosive chemical fumes which must be avoided are fluorocarbons and other halogenated compounds, most commonly present as refrigerants or solvents, such as Freon, trichlorethylene, perchlorethylene, chlorine, etc. These chemicals, when burned, form acids which quickly attack the heat exchanger finned tubes, headers, flue collectors, and the vent system. The result is improper combustion and a non- warrantable, premature appliance failure.
These chemicals, when burned form acids which quickly attack the boiler tubes, tube sheets, flue collectors, and the appliance stack. The result is improper combustion and a
EXHAUST FANS: Any fan or equipment which exhausts air from the equipment room may deplete the combustion air supply and/or cause a downdraft in the venting system. Spillage of flue products
from the venting system into an occupied living space can cause a very hazardous condition that must be immediately corrected. If a fan is used to supply combustion air to the equipment room, the installer must make sure that it does not cause drafts that could lead to nuisance operational problems with the appliance.
A construction air filter is installed on the appliance as shipped. The filter assembly is installed on the combustion air inlet located at the rear of the appliance. The filter assembly slips over the air inlet collar and is secured in place with the clamp provided with the filter. If limited space is available at the rear of the appliance, field supplied elbows may be used to mount the filter in the alternate positions shown in the illustration. This filter is For Temporary Use Only on an appliance that must be operated for temporary heat or hot water when a building is under construction. The filter will provide a temporary means to remove airborne dust, dirt and particulate matter generated by construction. The filter prevents airborne particulate contaminants from being drawn into the burner with the combustion air. The filter can be cleaned routinely during construction if necessary. Remove the filter to clean. Wash the filter with water. A flow of water from the inside to the outside should remove most particle matter. Allow the filter to dry before reinstalling. Unfiltered combustion air from a construction site can contain contaminants that will collect in the burner reducing the firing rate. A burner that becomes clogged with airborne particulate contaminants must be removed and cleaned to restore proper operation to the burner. Sustained operation of an appliance with a clogged burner may result in nuisance operational problems, bad combustion and
CONSTRUCTION AIR FILTER
E
D
C |
EDGE OF SCREEN
2"
ELBOW(S)
NOT
PROVIDED
REAR
CABINET AIR INLET OPENING
B |
FRONT |
MEDIA OVERLAP
FOLD OVERLAP AROUND
EDGE OF SCREEN AS
SHOWN.
BAND CLAMP
MODEL | A | B | C | D | E | REAR |
2.0 | 19.750 | 12.250 | 4.875 | 9.000 | 15.000 | 24.000 |
1.7 | 19.250 | 10.750 | 4.375 | 7.500 | 14.500 | 24.000 |
1.5 | 18.750 | 9.250 | 3.875 | 6.000 | 14.000 | 24.000 |
PUSH FILTER ONTO AIR INLET AND FASTEN WITH CLAMP AS SHOWN.
2"
FIG. 9 Construction Air Filter
7
