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2.2
special vent installations
2.2.1 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.
2.2.2 corner termination
The maximum vent length for a corner installation is 24" (610mm) of horizontal run, in addition to the 45° offset. In
this case zero rise is acceptable. See illustrations below. It is recommended to maintain a 6" (152mm) rise.
24" (61cm)
MINIMUM
REGARDLESS
OF HORIZONTAL
VENT LENGTH
25 3/8"
(64.5cm)
24" (61cm)
maximum
D
venting
EN
12"
(30.5cm)
min. to
grade
11
W415-2884 / A / 09.21.20
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