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3.2
special vent installations
3.2.1 periscope termination
Use the periscope kit to locate the air termination above grade. The periscope must
be installed so that when fi nal grading is completed, the bottom air slot is located a
minimum of 12" (305mm) above grade. The maximum allowable vent length is
10' (3.1m) for a fi replace and 8' (2.4m) for a stove.
3.2.2 reduced vent clearance to combustibles
The minimum clearances around the horizontal vent pipe to the combustible material may be reduced from
3" (76.2mm) / 2" (50.8mm) to 1" (25.4mm) in installations with a minimum of 52" (132cm) vertical rise made
immediately off the appliance collar and where the vent has been reduced to a 4/7" from 5/8" at the appliance.
24" (61cm) MIN
REGARDLESS OF
HORIZONTAL VENT
(97.2cm)
52"
(132cm)
38 1/4"
(97.2cm)
venting requirements
LENGTH
38 1/4"
8.2
90 1/4"
(229.2cm)
W415-4051 / C / 06.29.22
EN
12"
(30.5cm)
MIN TO
GRADE
13
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