INSTALLATION INSTRUCTIONS
Gas Furnace: (F/G)9MVE
440 01 4400 03
41
Specifications subject to change without notice.
Figure 47
Combustion Air and Vent Pipe Termination for Direct Vent (2
−
Pipe) System
L12F044
A
A
0
90
A
Vertical separation between
combustion air and vent
8
¾
in. (222mm) for 3 in.(76mm)
6
¾
in. (172mm) for 2in. (51mm)
Maintain 12 in. (305mm)
min. Clearance above
highest anticipated snow
level maximum of 24 in.
(614mm) above roof
18 in. Maximum
(457mm)
At least 36 in.
(914mm)
A
At least 36 in.
(914mm)
A
Concentric Vent and Combustion Air
Roof Termination (preferred)
Maintain 12 in. (305mm) min. Clearance
above highest anticipated snow level
maximum of 24 in. (614mm) above roof
1 in. (25mm) maximum
(Typ.) from wall to inlet
12 in. From Overhang
or roof (Typ.)
Abandoned masonry used
as raceway (per code)
Note:
“A” denotes 0 To 2 in. (51mm)
Between the first 2 vents Third
vent (and fourth vent, if used)
must be 36 in. Away (914mm)
12 in. Min from
overhang or
roof (Typ.)
At least 36 in.
(914mm)
12 in. (305mm) separation
between bottom of com
−
bustion air and bottom of
vent (Typ.)
Maintain 12 in. (305mm) min.
Clearance above highest an
−
ticipated snow level or grade
whichever is greater (Typ.)
At least 36 in.
(914mm)
At least 36 in.
(914mm)
Side wall termination of
less than 12 in. (305mm)
above highest snow level
Maintain 12 in. (305mm) min. Clear
−
ance above highest anticipated snow
level or grade whichever is greater
(Typ.)
Concentric Vent and Combustion Air
Side Termination
Roof Termination (Preferred)
Note:
“A” denotes 0 To 2 in. (51mm)
Between the first 2 vents Third
vent (and fourth vent, if used) must
be 36 in. Away (914mm)
Note:
36
−
in. separation between
pairs of inlets only required
for direct
−
vent systems
Figure 48
Vent Pipe Termination for Non
−
Direct Vent and Ventilated Combustion Air System
Abandoned masonry
used as raceway
(per code)
12 in. (305 mm) min. from
overhang or roof
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater.
Side wall termination
with 2 elbows (preferred)
12 in. min. (305 mm)from
overhang or roof
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater
6 in. (152mm) minimum clearance
between wall and end of vent pipe.
10 in. (254mm) maximum pipe length
Sidewall Termination
with Straight Pipe (preferred)
Roof Termination (Preferred)
Vent
Maintain 12 in
.
minimum clearance
above highest anticipated
snow level maximum of
24 in. (610mm) above roof
.
90
°
(305mm)
A05091
