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TWIN PIPE VENTING GUIDE
Conduite
The information and figures depicting method of terminating the
d'échappement
vent and combustion air intake pipes are directly related to PVC/
CPVC vent systems. When utilizing other than PVC/CPVC vent
system there may be some variations. Consult the respective
Entrée d'air
vent manufacturer or the water heater manual for recommenda-
de combustion
12"
tions and clarifications.
(30,5 cm)
min
12" (30,5 cm)
Slope horizontal exhaust piping downward toward the water
au-dessus du
heater a minimum of 1/4 inch per foot. DO NOT slope combus-
sol ou du
tion air piping down towards water heater. Dispose of conden-
niveau de
sate per local codes.
neige prévu
12" (30,5 cm) min
Figure 24: Sidewall Vent and Combustion
Air Piping with Tee Termination
12'' (30.5 cm) min
Exhaust Vent
12''
Combustion Air
(30.5 cm)
min
12'' (30.5 cm)
min above
anticipated
snow level
or grade
12" (30,5 cm)
min au-dessus
de l'entrée d'air
NOTE: All figures shown in this section is in reference to flat roofs.
For heights of venting passing through a pitched roof, refer to
NFPA 54/ANSI Z223.1-09 (see Figure 29) and/or CSA B149.1-10 .
N O T I C E
Mur
N O T I C E
Exhaust Vent
(30.5 cm)
1'' (2.5 cm)
min.
Combustion Air
between
wall &
socket end
Terminaison d'évent
Terminaison de l'entrée
d'air de combustion
12" (30,5 cm)
au-dessus du
plus haut niveau
de neige prévu
12" (30,5 cm) min
Figure 25: Sidewall Vent and Combustion Air Piping with
12'' (30.5 cm)
anticipated
PVC/CPVC Roof (Tee and upside down "U") Terminations
Locate the vent and intake air termination using the following
guidelines:
1) The total length of the vent or intake air piping must not ex-
ceed the limits given in Tables 11-14. The equivalent length
for 90° elbows and termination associated with the respective
vent and intake air piping arrangement MUST be subtracted
from total length listed in Tables 11-14.
2) For roof terminations installed as shown in Figure 27, the
intake air piping must terminate using a tee or combination
of elbows per Figures 26 & 27. The termination must be in-
stalled twelve (12) inches (30.5 cm), above roof or the high-
est anticipated snow level.
12''
3) The vent must terminate vertically with a coupling to facilitate
min
the bird screen and must be located twelve (12) inches (30.5
cm) minimum above the combustion air inlet as shown in
12''
Figures 26 & 27.
(30.5 cm)
4) The vent and intake air terminations must be located a radial
min
distance of twelve (12) inches minimum (30.5 cm) from outer
wall of vent termination to outer wall of combustion air intake
termination; refer to Figures 26 & 27.
Figure 26: Vertical Termination of TEE-Vent and
12'' (30.5 cm)
above air
25
Snorkel Termination
Exhaust Vent
Wall
12''
Combustion Air
(30.5 cm)
min
above
snow level
or grade
12'' (30.5 cm) min
Combustion Air Pipe
Exhaust Vent Termination
min
intake
opening
12'' (30.5 cm) min
Combustion air termination
12'' (30.5 cm)
above
anticipated
snow level
or grade
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