7
AFG Burner Manual
Combustion air supply
Appliance located in confined space
The confined space should have two (2) permanent
openings: one near the top of the enclosure and one
near the bottom of the enclosure. Each opening shall
have a free area of not less than (1) one square inch
per 1,000 BTU’s per hour of the total input rating of all
appliances within the enclosure. The openings shall
have free access to the building interior, which should
have adequate infiltration from the outside.
Exhaust fans and other air-using devices
Size air openings large enough to allow for all air-
using devices in addition to the minimum area required
for combustion air. If there is any possibility of the
equipment room developing negative pressure (because
of exhaust fans or clothes dryers, for example), either
pipe combustion air directly to the burner or provide a
sealed enclosure for the burner and supply it with its own
combustion air supply.
Direct air supply and sidewall venting
○ Some AFG burners are equipped with combustion
air boots to allow use of outside air for combustion.
○ Air boot kits are available to adapt most AF & AFG
burners. Please refer to the Replacement Parts
section on page 19-22.
○ When sidewall venting appliances, carefully
follow appliance and power venter instructions for
installation and wiring.
Outside air kit applications
Refer to separate instruction sheet(s) included with any
outside air kit or power vent system being installed.
Clearances to burner and appliance
○ Provide space around burner and appliance for easy
service and maintenance.
○ Check minimum clearances against those shown
by the appliance manufacturer and by applicable
building codes.
Combustion chamber — Burner retrofitting
Verify that the appliance combustion chamber provides
at least the minimum dimensions given in
Figure 5
.
Chamber Dimensions (inches)
Firing
Rate
(GPH)
Round
I.D.
Rectangular
Height
Floor
to
nozzle
Width
Length
0.50
8
7
8
12
5-6
0.75
9
8
9
12
5-6
1.00
10
9
10
12.5
5-6
1.25
11
10
11
12.5
5-6
1.50
12
11
12
13
6-7
2.00
14
12
15
13.5
6-7
2.50
16
13
17
14
7-8
3.00
18
14
18
15
7-8
Figure 5. Chamber Dimensions
Section: Inspect/Prepare Installation Site
y
The burner cannot properly burn the fuel if it is not
supplied with a reliable combustion air source.
y
Follow the guidelines in the latest editions of the
NFPA 31 and CSA-B139 regarding providing
adequate air for combustion and ventilation.
Failure to provide adequate air supply could
seriously affect the burner performance and result in
damage to the equipment, asphyxiation, explosion or
fire hazards.
Adequate Combustion
and Ventilation Air Supply
Required
Follow the Outside Air Kit
Instructions Exactly
y
Do not attempt to install outside air piping to
the burner without using the outside air kit and
instructions.
Failure to comply could result in impaired combustion,
appliance soot-up, puffback of smoke, and fire or
asphyxiation hazards.
