12" Min.
[30.5 cm]
36" Max. [91.4 cm]
12" Min.
[30.5 cm]
12" [30.5 cm] Min. Above Grade / Highest
Anticipated Snow Level
12" [30.5 cm]
(18” [45.7 cm] Canada) Above
Highest Anticipated Snow Level Typ.
1" [2.5 cm]
From Wall to
Edge of
Coupling-Air
Combustion Air
Terminations
Vent Terminations
22
CHAPTER 2
CHAPTER 2 - DIRECT VENT INSTALLATION OF VENT/AIR PIPING
Fig. 13 - Direct Vent - Vertical Vent and Sidewall Combustion Air Terminations of Multiple
INSTINCT Boilers
2.3.4 Termination Fittings - Vertical & Sidewall
1. The vent and combustion air terminations must
include a factory supplied “bird screen” installed as
shown in Fig. 3 on page 14 & Fig. 10 on page 18.
2. The combustion air piping must terminate using a
90º elbow as shown in Fig. 6 or Fig. 8 on page 17.
3. The vent piping must terminate vertically with a
coupling, as shown in Fig. 12 on page 19.
Do not extend the vent pipe above the roof
beyond the dimension shown in Fig. 12 on
page 19. Extended exposure of the vent
pipe could cause condensate to freeze and
block the vent pipe, resulting in substantial
property damage, serious injury, or death.
WARNING
2.3.5 Direct Vent - Multiple Boiler Installation -
Vertical Vent and Sidewall Combustion Air
1. On installations of multiple INSTINCT boilers, ter-
minate each vent and combustion air pipe as de-
scribed in this manual.
2. Each vent and combustion air termination must be
a minimum 12” [30.5 cm] from the adjacent termi-
nation for installations in the U.S. as shown in Fig. 13
below. For installations in Canada, provide clearanc-
es as required by CAN/CSA B149.1.
The combustion air inlet of the INSTINCT is de-
fined as being part of a direct vent system. It is
not considered as a forced air intake. The re-
quired clearance of an adjacent boiler vent to
a forced air inlet does not apply in a multiple
installation of INSTINCT boilers.
NOTICE
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