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Part number 550-110-260/0200
11
Boiler Manual
Figure 3 Sizing air openings for CGs installations
Outside
Outside or ventilated attic
Ventilated
crawl space
Or
CGs
12”
Max
Duct
Air from or —
Lower Opening in Floor
or Vertical Duct
Outside Attic
D
Air
opening
Air
opening
Outside
Inside
CGs
12”
Max
12”
Max
Duct
Duct
Air from
Through horizontal
ducts
Outside
C
Air
opening
Air
opening
12”
Max
12”
Max
Outside
CGs
Air
from
Directly
Outside
B
Air
opening
Air
opening
12”
Max
12”
Max
Outside
Inside
CGs
Air from Inside
A
Other
appliances
CGs CGs
Direct exhaust vent installation
(CGs using room air for combustion)
Room Air Openings
Exception to
combustion air
opening rules:
Direct vent installation
(combustion air piped to CGs)
Room
with other appliances
shared Room
with other appliances
shared
CGs
in room
alone CGs
in room
alone
CGs
Combustion
air piping
Other
appliances
CGs
Combustion
air piping
Required area of the air openings given in this
table are free area — after the correction for
louver obstruction. (See below.)Exception
Apply this table only to installations with
clearances no smaller than those shown in
Figure 1, page 7 of this manual.
For installations with clearances less than
shown in Figure 1, page 7 of this manual,
provide 2 openings, each with 1 square inch
of free area per 1,000 Btuh of total input of
all appliances.
2 Openings —
each opening:
2 Openings —
each opening:
2 Openings —
each opening:
2 Openings —
each opening:
2 Openings —
each opening:
2 Openings —
each opening:
2 Openings —
each opening:
2 Openings —
each opening:
2 Openings —
each opening:
2 Openings —
each opening:
2 Openings —
each opening:
2 Openings —
each opening:
NO Openings are
needed, provided:
NO
NO LESS
Building must not be of Tight construction
Example:
combustionair openings areneeded when theboiler (and otherappliances) are installedin a spacewith a volume
than 50 cubic feet per 1,000 Btuh of all installed appliances. Sum the total input of all appliances in MBH
(1,000'sof Btuh)andmultiply thisnumbertimes 50. (seepage10).
For total input of 100 MBH (100,000 Btuh), minimum volume is 50 x 100 = 5,000 cubic feet. At a ceiling
heightof8 feet,spacemust haveatleast 5,000÷8=625squarefeet(25 feetx25 feet,forinstance).
NO Openings are
needed, provided:
NO Openings are
needed, provided:
NO Openings are
needed, provided:
Clearance around
boiler is
than shown in
Figure 1, page 7
of this manual.
NO LESS
Clearance around
boiler is
than shown in
Figure 1, page 7
of this manual.
NO LESS
Clearance around
boiler is
than shown in
Figure 1, page 7
of this manual.
NO LESS
Clearance around
boiler is
than shown in
Figure 1, page 7
of this manual.
NO LESS
1 square inch
free area per
1 square inch
free area per
1 square inch
free area per
1 square inch
free area per
1 square inch
free area per
1 square inch
free area per
1 square inch
free area per
1 square inch
free area per
1 square inch
free area per
1 square inch
free area per
1 square inch
free area per
1 square inch
free area per
1,000
plus CGs
Btuh input of
other appliances
4,000
plus CGs
Btuh input of
other appliances
2,000
plus CGs
Btuh input of
other appliances
4,000
plus CGs
Btuh input of
other appliances
1,000
CGs
Btuh input of
other appliances
only (not )
4,000
CGs
Btuh input of
other appliances
only (not )
2,000
CGs
Btuh input of
other appliances
only (not )
4,000
CGs
Btuh input of
other appliances
only (not )
4,000
CGs
Btuh input
of
4,000
CGs
Btuh input
of
4,000
CGs
Btuh input
of
4,000
CGs
Btuh input
of
26007