Payne PG9MXA Installation, Start-Up, And Operating Instructions Manual page 45

Roof T e rmination (Preferred)
At least 36 in.
(914mm)
Vertical separation
between combustion
air and vent
8 3/4 in. (222mm)for 3 in. (76mm)kit
18 in. maximum (457mm)
6 3/4 in. (172mm)for 2 in. (51mm) ki t
Maintain 12 in. (305mm)min .
clearance above
highest anticipated
snow level
Maximum of 24 in.(614mm)
above roof
Note: "A" denotes 0 to < 2 in.
Between the first 2 vents
Third vent must be > 36 in. away
90°
Fig. 44 - - Combustion Air and Vent Pipe Termination for Direct Vent (2- -pipe) System
Maintain 12 in
minimum clearance
above highest anticipated
snow level maximum of
24 in. (610mm) above roof
Fig. 45 - - Vent Pipe Termination for Non-Direct Vent (1-pipe) System
A
Abandoned masonry
used as raceway
(per code)
(51mm)
(914mm)
12 in. min from
overhang or roof
(typ)
in. (305mm)
12
separation between
bottom ofcombustion air and
A
bottom of vent (typ)
in. (305mm)
Maintain 12
min. clearance above
highest anticipated
snow level or grade
whichever is greater (typ)
Roof Termination (Preferred)
Vent
(305mm) .
.
Abandoned masonry
used as raceway
(per code)
12 in. (305 mm) min. from
overhang or roof
90°
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater.
Side wall termination
with 2 elbows (preferred)
45
Concentric Vent and Combustion Air
Roof Termination (preferred)
A
At least
36 in.
(914mm)
A
At least 36 in.
(914mm)
Side wall termination
of less than 12 in. (305mm) above highest snow level
12 in. min. (305 mm)from
overhang or roof
6 in. (152mm) minimum clearance
between wall and end of vent pipe.
10 in. (254mm) maximum pipe lengt h
Sidewall Termination
with Straight Pipe (preferred)
in.
Maintain 12 (305mm)
min. clearance above
highest anticipated
snow level, maximum of
24 in. above roof
1 in. (25mm) maximum (typ) from wall to inlet
12 in. (305mm) minimum from
overhang or roof
A
in. (305mm)
Maintain 12
min. clearance above
highest anticipated
snow level or grade
whichever is greater
Concentric Vent
and Combustion - Air
Side T e rmination
A05090
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater
A05091