Beckett AFII manual Direct/Sidewall Venting Application, Outside Air Connection

Section: Inspect/Prepare Installation Site

Eventually the blockage could prevent exhausting the flue gases. Instead, the flue 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

Adequate Combustion

and Ventilation Air Supply

Required

Failure to provide adequate air supply could seriously affect the burner performance and result in damage to the equipment, asphyxiation, explosion or fire hazards.

yThe burner cannot properly burn the fuel if it is not supplied with a reliable combustion air source.

yFollow the guidelines in the latest editions of the NFPA 31 and CSA-B139 regarding providing adequate air for combustion and ventilation.

Appliances located in confined spaces: All confined 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 infiltration 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

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.

1.Remove the inlet cover.

2.Insert 4” duct into the inlet ring.

3.Fasten duct into place using at least 3 sheet metal screws evenly spaced around the inlet ring. Refer to Figure 3.

4.Remove the barometric draft control unless it is in the same atmospheric pressure zone as the inlet.

Figure 3. Outside Air Connection

Air

Inlet

Elbow

4 inch Duct

1/4” Mesh Screen

SK8810

Inlet Ring

Figure 2 - Chimney Design - Above the Roof
NOTE: Correct
chimney design is	Minimum Clearence:	2 FT.
shown by dotted lines.
Incorrect chimney
design, as shown by
the solid lines, may
result in down-drafts.

AFII Burner Manual

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