21
1. Remove screws and combustion air flange from cabinet.
2. Insert cabinet plug in unused combustion air hole.
3. Drill a pilot hole at the cabinet dimple (size dictated by knockout tool used).
4. Use a knockout tool to create a 3" diameter hole
5. Install combustion air flange and secure with screws removed in step one.
V
ENT
/F
LUE
P
IPE
L
ENGTHS
AND
D
IAMETERS
Refer to the following table for applicable length, elbows, and pipe diameter for construction of the vent/flue pipe system. The tee
used in the vent/flue termination must be counted as an elbow
when determining the number of elbows in the piping system.
For installations at or above 7,000 feet altitude, use 3” vent-
ing.
1) Maximum allowable limits listed on individual lengths for inlet and flue
and NOT a combination.
2) Minimum requirement for each vent pipe is five (5) feet in length and
one elbow/tee.
3) Tee used in the vent/flue termination must be included when deter-
mining the number of elbows in the piping system.
4) 2 1/2” or 3” diameter pipe can be used in place of 2” diameter pipe.
5) Increased Clearance Configurations using (2) 45 deg. elbows should
be considered equivalent to one 90 deg. elbow.
6) One 90° elbow should be secured to the combustion air intake con-
nection.
7) For installations at or above 7,000 feet altitude, use 3” venting.
V
ENT
/F
LUE
P
IPE
T
ERMINATIONS
NOTE:
If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
The vent/flue pipe may terminate vertically, as through a roof, or
horizontally, as through an outside wall.
Vertical vent/flue pipe terminations should be as shown in the following figure. Refer to
Vent/Flue Pipe and Combustion Air Pipe -
Termination Locations
for details concerning location restrictions. The penetration of the vent through the roof must be sealed tight
with proper flashing such as is used with a plastic plumbing vent.
COMBUSTION AIR INTAKE
(OPTIONAL)
*Not required for
singl e pipe installation
TEE (OPTIONAL)
96
” M
AX
. -
3”
MI
N.
RO
OF
LIN
E
12” MIN
HEIGHT DIFFERENCE
BETWEEN
INTAKE AND VENT
12” MIN TO ROOF OR HIGHEST
ANTICIPATED SNOW LEVEL
Figure 13
STRAIGHT
ELBOWS
Figure 14
1
2
3
4
5
6
7
8
2 or 2 1/2
115
110
105
100
95
90
85
80
3
137
130
123
116
109
102
95
88
2 or 2 1/2
115
110
105
100
95
90
85
80
3
147
140
133
126
119
112
105
98
2 or 2 1/2
60
55
50
45
40
35
30
25
3
120
113
106
99
92
85
78
71
2 or 2 1/2
40
35
30
25
20
15
10
5
3
144
137
130
123
116
109
102
95
2 or 2 1/2
40
35
30
25
20
15
10
5
3
144
137
130
123
116
109
102
95
2 or 2 1/2
95
90
85
80
75
70
65
60
3
144
137
130
123
116
109
102
95
2 or 2 1/2
95
90
85
80
75
70
65
60
3
144
137
130
123
116
109
102
95
2 or 2 1/2
60
55
50
45
40
35
30
25
3
120
113
106
99
92
85
78
71
2 or 2 1/2
40
35
30
25
20
15
10
5
3
103
96
89
82
75
68
61
54
Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe)
(6)
Pipe
Size
Model
Number of Elbows
*MVM970603BNA*
*MVM970803BNA*
*MVM970804CNA*
*MVM971005CNA*
*CVM971005CNA*
*MVM971205DNA*
*CVM970603BNA*
*CVM970803BNA*
*CVM970804CNA*
