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W415-0777 / 03.02.09
2.3 SPECIAL VENT INSTALLATIONS
2.3.1 PERISCOPE TERMINATION
Use the periscope kit to locate the air termination above grade. The periscope must
be installed so that when final grading is completed, the bottom air slot is located a
minimum of 12" above grade. The maximum allowable vent lengths depends on the
heater, as illustrated.
9.5
35 1/2"
24" MIN
12" MIN
TO GRADE
FIGURE 2.3.1