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Combustion Air/Vent Pipe Requirements Continued
Failure to follow these warnings could result
in fi re, property damage, personal injury, or
death.
When vent pipe is exposed to temperatures
below freezing, such as when it passes through
unheated space or when chimney is used as
chaseway, vent pipe must be insulated with
1/2"armafl ex or equivalent. In extremely cold
climate areas, use 3/4"armafl ex or equivalent.
Combustion air must be clean outdoor air.
Combustion air must not be taken from
inside structure because that air is frequently
contaminated by halogens, which include
fl uorides, chlorides, phosphates, bromides and
iodides. These elements are found in aerosols,
detergents, bleaches, cleaning solvents, salts,
!
air fresheners, paints, adhesives, and other
household products.
Locate combustion air inlet as far away as
possible from swimming pool and swimming
pool pump house. All combustion air and
vent pipes must be airtight and watertight.
Combustion air and vent piping must also
terminate exactly as shown in fi gures #1 – #2.
If a concentric vent termination is being used,
refer to fi gures #3 – #5 for proper setup.
Vent connections serving appliances vented by
natural draft shall not be connected into any
portion of mechanical draft systems operating
under positive pressure.
Solvent cements are combustible. Keep away
from heat, sparks, or open fl ame. Use only in
well ventilated areas. Avoid breathing in vapor
or allowing contact with skin or eyes.
Figure 4 - Concentric Vent
STRAP
A
(FIELD SUPPLIED)
ELBOW
B
(FIELD SUPPLIED)
C
1" MAXIMUM
VENT
COMBUSTION AIR
NOTE:
SECURING STRAP MUST BE FIELD INSTALLED TO
PREVENT MOVEMENT OF TERMINATION KIT IN SIDE
WALL.
BEFORE INSTALLING THE BOILER
WARNING
B
C
A
Figure 5 - Concentric Vent Roof Installation
A
B
C
D
A
B
C
Intake/Combustion Air
A
COMBUSTION
AIR
VENT
B
8
NOTE:
SUPPORT MUST BE
FIELD INSTALLED TO
SECURE TERMINATION
KIT TO STRUCTURE.
COMBUSTION AIR
A
ROOF BOOT/FLASHING
(FIELD SUPPLIED)
ELBOW
(FIELD SUPPLIED)
SUPPORT
(FIELD SUPPLIED)
MAINTANIN 12 IN.
(18IN. FOR CANADA)
VENT
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF
Dimension
3" Diameter PVC
Vent/Exhaust
1½"
3" Diameter PVC
G
D
C
E
VENT
D
C
B
COM
AIR
Dimension
1 ³⁄16 "
D
E
46¾"
F
31⅞"
G
4½" Dia.
F
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