Slant/Fin VSL-160C Part B - Manual (Page 17)

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10 - INSTALLATION - Vent and combustion air
10.13.4 - Multiple vent/air
terminations
1. When terminating multiple boilers,
terminate each vent/air connection
as shown in Figures 10-24 and 10-
25.
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
boiler for U.S. installations (see
Figure 10-24). 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 boiler vents.
Figure 10-25 Alternate vertical terminations
with multiple boilers
vertically from
vent outlet to
any air inlet
Vent
Vent
Air intake Air intake
NOTE: keep the terminals at min. 12” from grade or
snow line. Provide vent and air intake with bird screen.
Figure 10-24 Two pipes Multiple boilers vertical
terminations
vertically from
vent outlet to
any air inlet
from edge of
air intake pipe
to adjacent
vent pipe from
another boiler
NOTE: 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