Operating instructions

9
W415-0680 / 04.10.08
SPECIAL VENT INSTALLATIONS
Use the GD201 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"
above grade. The maximum allowable vent length is 10'.
REAR EXIT INSTALLATIONTOP EXIT INSTALLATION
The maximum vent length for a corner installation is 20" of horizontal run, in addition to the 45° offset. In this case zero rise
is acceptable when using rigid. See FIGURE 18. Flexible venting must maintain a 6" rise. See FIGURE 19.
PERISCOPE TERMINATION
CORNER TERMINATION
BCDV36CF(G)
BCDV42CF
PERISCOPE TERMINATION
Use the GD401 periscope kit to locate the air termination above
grade. The periscope must be installed so that when fi nal grad-
ing is completed, the bottom air slot is located a minimum of 12"
above grade. The maximum allowable vent length is 10'.
FIGURE 15
FIGURE 16
FIGURE 17
FIGURE 18 FIGURE 19
30"
MINIMUM
12" MIN
TO GRADE
30"
MINIMUM
12" MIN
TO GRADE
20" MAX
6" RISE
CORNER INSTALLATION
24" MINIMUM
12" MIN
TO GRADE