Installation Guide

22
VENT/FLUE & COMBUSTION AIR PIPE LENGTHS & DIAMETERS
If there is a difference between the vent and combustion air pipes, count
the pipe with the most fittings. Elbows and/or tees used in the
terminations must be included when determining the number of
elbows in the piping systems.
If the combustion air intake pipe is to be installed above a finished
ceiling or other area where dripping of condensate will be objec-
tionable, insulation of the combustion air pipe may be required.
Use 1/2” thick closed cell foam insulation such as Armaflex™ or
Insultube™ where required.
Vent & Combustion Air Intake Measurements for Standard
Horizontal Terminations (Dual Pipe)
Center to center = 10” min / 24” max.
Vertical separation: 0” - 24”
Vent termination from wall = 8” min / 12” max.
Combustion air intake from wall = 6” max.
Vent and intake clearance to ground
or anticipated snow level = 12” min.
90º OR 45°
ELBOW
SCREEN
(OPTIONAL)
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
6” MAX
10”- 24”
4” MIN
Standard Horizontal Terminations (Dual Pipe)
Figure 16
SCREEN
(OPTIONAL)
AIR
INTAKE
90°
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3” - 24”
Alternate Horizontal Vent Termination (Dual Pipe)
Figure 17
SCREEN
(OPTIONAL)
AIR
INTAKE
90°
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3”-24” BETWEEN PIPES
Figure 18
Combustion Air Intake may also be snorkeled to obtain 12” min ground
clearance.
Alternate Vent Termination Above Anticipated Snow Level
(Dual Pipe)
VENT/FLUE TEE (
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
OPTIONAL)
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
12" MIN.
Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
Figure 15