9
W415-0661 / 12.07.07
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 INSTALLATION
TOP 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
BGD36CF(G)
BGD42CF
PERISCOPE TERMINATION
Use the GD401 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'.
FIGURE 15
FIGURE 16
FIGURE 18
FIGURE 19
FIGURE 17
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