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downward slope
1/4" per foot
Ceiling
Vent Pipe
Wall Plates
Board
Inspection
Fire
Stop
Access Panel #1
Inspection
Access
Panel #2
94° Elbow
(optional)
(optional)
12” (min)
(30 cm)
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AP15317 (10_09) DV Gas Manual 10 30 09.indd 10 11/9/2009 3:10:25 PM