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11 - INSTALLATION - Vent and combustion air
11.13.4 - Multiple vent/air
terminations
1. When terminating multiple heaters,
terminate each vent/air connection
as shown in Figures 11-23 and 11-
24.
WARNING!!!
Terminate all
vent pipes at the same height
and all air pipes at the same
height to avoid possibility
of severe personal injury,
death, or substantial property
damage.
2. Place roof penetrations to obtain
minimum clearance of 12 inches
between edge of air intake elbow
and adjacent vent pipe of another
heater for U.S. installations (see
Figure 10-23). For Canadian
installations, provide clearances
required by CSA B149.1 Installation
Code.
3. The air inlet is part of a direct vent
connection. It is not classifi ed as
a forced air intake with regard to
spacing from adjacent heater vents.
Figure 11-24 Alternate vertical terminations
with multiple heaters
vertically from
vent outlet to
any air inlet
Vent
Vent
Air intake
Air intake
NOTICE! keep the terminals at min. 12” from grade or
snow line. Provide vent and air intake with bird screen.
Figure 11-23 Two pipes Multiple heaters vertical
terminations
vertically from
vent outlet to
any air inlet
from edge of
air intake pipe
to adjacent
vent pipe from
another heater
NOTICE! keep the terminals at min. 12” from grade or
snow line. Provide vent and air intake with bird screen.
Vent
Vent
Air intake
Air intake
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