Operating instructions

26
Concentric
Vent Roof
Terminations
 Glue inner vent pipe to prevent
recirculation.
 Maintain 12" (305mm) US
(18"(457mm) Canada) minimum
clearance above highest
anticipated snow level. Maximum of
24"(610mm) above roof.
 Support must be eld installed to
secure termination kit to structure.
 Elbow, roof boot/ashing eld supplied.
 Allowed Wall/Roof thickness 1/2"-30"
(12.7mm - 762mm).
 Vertical concentric vent system can be
installed in unused masonry chimney.
Combustion Air
Roof boot/ashing
(eld supplied)
Support
(eld supplied)
Combustion Air
Vent
Note: Support must
be eld installed to
secure termination
kit to structure
Vent
Maintain 12"(305mm) US
(18"(457mm) Canada)
clearance above highest
anticipated snow level 24"
(610mm) above roof
FIGURE 6-8 Flue on Roof, Air Intake on Side Wall
FIGURE 6-9 Flue on Roof, Combustion Air
Grade, Snow
& Ice
Terminate vent system bottom, minimum
12" (300 mm) above highest anticipated
snow level.
Avoid locations where snow may drift
and block vent and combustion air.
Ice or snow may cause boiler to shut
down if vent or combustion air becomes
obstructed.
Doors &
Windows
Combustion air and vent termination
must be 12" (305mm) from or below
doors, windows or gravity inlet.
* See Tables
4 & 5
Combustion air and Vent Piping Length
Page 22 .
FIGURE 6-7 Concentric Roof Terminal
6 - COMBUSTION AIR AND VENT PIPING
Maintain 12"(305mm) US
(18"(457mm) Canada)
clearance above highest
anticipated snow level 24"
(610mm) above roof
Combustion Air
Vent
12" (305mm)
Anticipated
Snow Line
Ground Level
Combustion
Air
Vent
24" (610mm)
* Minimum Length
Maintain 12"(305mm) US
(18"(457mm) Canada)
clearance above highest
anticipated snow level 24"
(610mm) above roof