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Equivalent Vent Length
*1
Equivalent vent length calculation
87º elbow
Vent pipe (3.3 ft./1 m)
Vent pipe (1.65 ft./0.5 m)
Vent termination
*1
First elbow not included in equivalent
vent calculation.
Venting Option
H The maximum vent length on all
models is 20 ft./6 m.
H The minimum vent length on all
models is 17"/425 mm (length of the vent
termination when cut to the minimum
permissible length).
H Do not exceed the maximum vent
length.
H Do not use more than five elbows
within one vent system.
H First 87º elbow on boiler is not
included in equivalent vent length
calculation.
Type of fitting
Equivalent length
87º elbow/
1.65 ft./0.5 m
87º inspection tee
45º elbow
1 ft./0.3 m
Equivalent vent length calculation example
2 x 87º elbow
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 x vent pipe (1 m)
. . . . . . . . . . . . . . . . . . . . . . . .
1 x vent pipe (0.5 m)
. . . . . . . . . . . . .
1 x vent termination
. . . . . . . . . . . . . . .
Total equivalent length
13.95 ft./4.23 m
IMPORTANT
First elbow not included in equivalent vent
calculation.
Always include vent termination length in
calculations.
3.3 ft./1 m
6.6 ft./2 m
1.65 ft./0.5 m
2.4 ft./0.73 m
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