25
6 - COMBUSTION AIR AND VENT PIPING
FIGURE 6-7 - Concentric Vent Screw Placement
Note
Before securing screws, verify pipe is pushed in
a minimum of 1 ¾" (45mm) into gasketed end of
the other pipe.
D.
Concentric Vent Screw Placement - See Figure 6.7
Fasten two screws through outer intake pipe behind the
gaskets at equal distances approx. 180º apart.
Note - screws used must be no larger than No.8 - 1/2" sheet
metal screws and must be zinc coated. Length of this screw
must be 0.75 in (19.00 mm).
When connecting vent pipes use only a small amount of
silicone grease supplied with the exhaust pipes. Do not use
other types of grease.
FIGURE 6-5 - Maximum Equivalent Length
Maximum Length = L
A B
21’ (6.4 m)
C D
17' 8" (5.4 m)
E F
21’ (6.4 m)
G
14’ 5" (4.4 m)
H
17'8" (5.4 m)
FIGURE 6-6 (A-H)
P/N 240011654, Rev. C [06/08/2017]
