Dunkirk GWB9-050IH-2 Installation Instructions Manual page 26

Figure 15 - Concentric Vent Terminations
1" (2.54cm)
Maximum
Combustion
Air
1" (2.54cm)
Maximum
12" (30cm) Minimum
* See Note
Below
Vent
Combustion
Air
*Must be less than 4" or greater than 24" Horizontal dis-
tance between end bells of each air intake to prevent fl ue
gas recirculation.
Figure 16 - 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.
COMBUSTION AIR AND VENT PIPE
Vent
Overhang
36"(0.9m) Minimum
Maintain 12"
Maintain 12"(30cm)
clearance above
clearance above highest
highest anticipated
anticipated snow level or
snow level or grade
grade
B
C
A
Figure 17 - Concentric Vent Roof
A
B
C
D
COMBUSTION
AIR
VENT
26
Installation
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
VENT
D
C
B
COM
AIR