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W415-1397 / 09.30.14
EN
3.3 SPECIAL VENT INSTALLATIONS
3.3.1 PERISCOPE TERMINATION
12" (305MM)
MINIMUM
TO GRADE
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 12” (304.8mm) above grade. The
maximum allowable vent length is 10’ (3.1m) for a
fi
replace and 8’ (2.4m) for a stove.
9.4A
12" (305MM)
MINIMUM
TO GRADE
30" (762MM)
MINIMUM
30" (762MM)
MINIMUM
34 1/16"
(865MM)
20” (508mm)
20” (508mm)
MAXIMUM
6” (152.4mm)
RISE
3.3.2 CORNER TERMINATION
The maximum vent length for a corner installation is 20" (508mm) 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.