Filter
Top Products
7
AFII Burner Manual
the burner or provide a sealed enclosure for the burner
and supply it with its own combustion air supply.
Direct/Sidewall Venting Application
When sidewall venting appliances, carefully
follow appliance and power venter instructions for
installation and wiring.
AFII burners are equipped with a removable air
inlet to allow use of a 4” duct to supply outside air
for combustion. Do not exceed 50 equivalent feet.
Allow 6 feet for each elbow.
Remove the inlet cover.
Insert 4” duct into the inlet ring.
Fasten duct into place using at least 3 sheet
metal screws evenly spaced around the inlet
ring. Refer to Figure 3.
Remove the barometric draft control unless it is
in the same atmospheric pressure zone as the
inlet.
○
○
1.
2.
3.
4.
Eventually the blockage could prevent exhausting the
fl ue gases. Instead, the fl ue gases could vent out the
barometric damper into the living space.
Therefore, it is strongly recommended that an approved
insulated stainless steel liner be installed.
Combustion Air Supply Information
Section: Inspect/Prepare Installation Site
The burner cannot properly burn the fuel if it is not
supplied with a reliable combustion air source.
Follow the guidelines in the latest editions of the
NFPA 31 and CSA-B139 regarding providing
adequate air for combustion and ventilation.
y
y
Failure to provide adequate air supply could
seriously affect the burner performance and result in
damage to the equipment, asphyxiation, explosion or
fi re hazards.
Adequate Combustion
and Ventilation Air Supply
Required
Figure 2 - Chimney Design - Above the Roof
Minimum Clearence: 2 FT.
NOTE: Correct
chimney design is
shown by dotted lines.
Incorrect chimney
design, as shown by
the solid lines, may
result in down-drafts.
Appliances located in confi ned spaces: All confi ned
spaces should have two (2) permanent openings; one
near the top of the enclosure and one near the bottom
of the enclosure. Each opening must have a free area
of not less than one (1) square inch per 1,000 BTU’s per
hour of the total input rating of all appliances within the
enclosure. The openings should have free access to the
building interior, which should have adequate infi ltration
from the outside.
Exhaust fans and other air-using devices: Size air
openings large enough to supply all air-using devices
in addition to the minimum size required for combustion
air. If there is any possibility of the equipment room
developing a negative pressure due to exhaust fans,
clothes dryers, etc., either pipe combustion air directly to
4 inch Duct
Air
Inlet
Elbow
1/4”
Mesh
Screen
Inlet Ring
SK8810
Figure 3. Outside Air Connection