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Air openings for combustion and
ventilation air
Adequate combustion and ventilation air
ensures proper combustion and reduces
risk of severe personal injury or death
from possible ue gas leakage and carbon
monoxide emissions.
Do not install exhaust fan in boiler room.
Older buildings with single-pane windows, minimal
weather-stripping and no vapor barrier oen provide
enough natural inltration and ventilation without
dedicated openings.
Tight construction
New construction or remodeled buildings are most oen
built tighter. Windows and doors are weather-stripped,
vapor barriers are used and openings in walls are
caulked. As a result, such tight construction is unlikely
to allow proper natural air inltration and ventilation.
Follow state, provincial or local codes when sizing
adequate combustion and ventilation air openings. In
absence of codes, use the following guidelines when
boiler is in a conned room (dened by NFPA 31 as less
than 7200 cubic feet per 1 GPH input of all appliances in
area. A room 8 . high x 33.5 . x 33.5 . is 7200 cu. .).
Provide two permanent openings
Provide two permanent openings — one within 12
inches of ceiling, one within 12 inches of oor. Mini-
mum height or length dimension of each rectangular
opening should be at least 3 inches.
Air from inside the building
When inside air is used — each opening must freely
connect with areas having adequate inltration from
outside. Each opening should be at least 140 sq. in. per
1 GPH input (1 sq. in. per 1000 Btu input) of all fuel-
burning appliances plus requirements for any equipment
that can pull air from room (including clothes dryer
and replace).
Air from outside the building
When outside air is used — connect each opening
directly or by ducts to the outdoors or to crawl or attic
space that freely connects with outdoors. Size per below:
• rough outside wall or vertical ducts — at least 35
sq. in. per 1 GPH input (1 sq. in. per 4000 Btu input)
of all fuel-burning appliances plus requirements for
any equipment that can pull air from room (includ-
ing clothes dryer and replace).
• rough horizontal ducts — at least 70 sq. in. per 1
GPH boiler input (1 sq. in. per 2000 Btu input) of all
fuel-burning appliances plus requirements for any
equipment that can pull air from room (including
clothes dryer and replace).
• Where ducts are used, they should have same cross-
sectional area as free area of openings to which they
connect. Compensate for louver, grille or screen
blockage when calculating free air openings. Refer
to their manufacturer’s instructions for details. If
unknown, use:
— Wood louvers, which provide 20-25% free air.
— Metal louvers or grilles, which provide
60-75% free air.
Lock louvers in open position or interlock with equip-
ment to prove open before boiler operation.
Flooring and foundation
1. Install on any level, properly-supported, and non-
carpeted surface. Flooring may be combustible if
boiler leveling legs are installed.
2. Ensure the ooring is capable of handling the boiler
weight (see page 39 for weight and water volume).
Install boiler so the burner is at least 18 inches above the
oor to avoid contact with gasoline fumes.
Provide a level concrete, masonry or cement block
foundation if the ooring could become ooded or is
not level. See Table 1 for foundation size required.
Prepare boiler location(continued)
Part number 550-143-013/0621
9
Series 3
49 23 2
53 23 2
57 23 2
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