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17
Maintain a minimum distance from the vent
and combustion air-inlet terminals of not
less than 1 ft. above grade or above average
snowfall whichever is greater.
Connect the vent riser assemblies to the vent
and combustion air-inlet pipes which are
extending out of the building.
• Ensure that the back of the 90° elbows
are flush with the outside wall surface
and that the vent and combustion air-inlet
terminations of the vent risers are parallel
with the outside wall.
IMPORTANT: Remember to include the
additional 90° elbows and vertical height
of the vent and combustion air-inlet pipes
of the vent riser when calculating the
maximum equivalent vent and combustion
air-inlet system lengths. The maximum
equivalent vent and combustion air-inlet
system lengths must be as specified on page
13.
Alternate Horizontal Vent and Combustion Air-Inlet Terminal Installation
Horizontal Vent and Combustion Air-Inlet Alternate Vent Riser Terminal
Installation
*
*
* Clearance is equal and
parallel to wall
Side View
12 in.
min.
Terminal assemblies to be parallel to wall.
Front View
Option 1
Short piece of pipe
Vent Outlet
Combustion Air
Inlet
Wind Vane
-B-
d
.008
d
.010
2 ft. x 2 ft. Sheet Metal
Shield on Brick or Masonry
Walls (Optional for air inlet
termination)
Slope horizontal
pipe upward 1/8
in. per foot min.
Rear of Termination
Flush with Outside
of Wall
Outside of
Building
Inside of
Building
Slope horizontal pipe
upward 1/8 in. per
foot min.
Min 6 in.
Slope horizontal
pipe upward 1/8
in. per foot min.
Wind Vane on
Combustion Air-Inlet
Terminal
Combustion Air-Inlet
12 in. min.
Terminal assemblies to be parallel to wall
Front View
Option 2
Short piece of pipe
Wind Vane
Termination
Openings 12 in.
min. above grade
or above anticipated
snow level
Combustion Air
Inlet
Vent Outlet
Exhaust
Vent
Vent Connector Fitting
Rear of elbow flush
with outside wall
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