Intertek MVM97 Series Installation Instructions Manual page 21

Type fsp category iv direct or non direct vent air furnace
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air opening can be used. A locating dimple is located on the right side of the furnace cabinet. The locating dimple is 1 7/8"
measured from the front edge of the cabinet in line with the knock out. To use the alternate combustion air location:
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
/F
P
L
ENT
LUE
IPE
ENGTHS AND
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.
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 determin-
ing 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 connection.
V
/F
P
T
ENT
LUE
IPE
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.
Horizontal 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 wall penetration should be sealed with silicone caulk-
ing material.
NOTE: Terminate both pipes in the same pressure zone (same side of roof, no major obstacles between pipes, etc.).
COMBUSTION AIR INTAKE
(OPTIONAL)
*Not required for
single pipe installation
INTAKE
SCREEN
OPTIONAL
12" MIN TO ROOF OR HIGHEST
ANTICIPATED SNOW LEVEL
D
IAMETERS
TEE (OPTIONAL)
12" MIN
HEIGHT DIFFERENCE
BETWEEN
INTAKE AND VENT
Figure 13
*MVM97/*CVM97 Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe)
Maximum Allowable Length of Vent/Flue Pipe & Combustion Air Pipe (ft)
Unit
Pipe Size
Input
(4)
(in.)
0
1
(Btu)
2
60,000
250
245
or 2 1/2
2
80,000
250
245
or 2 1/2
80,000
3
250
243
2
100,000
90
85
or 2 1/2
100,000
3
250
243
2
120,000
75
70
or 2 1/2
120,000
3
220
213
STRAIGHT
(3) (5)
Number of Elbows
2
3
4
5
6
240
235
230
225
220
240
235
230
225
220
236
229
222
215
208
80
75
70
65
60
236
229
222
215
208
65
60
55
50
45
206
199
192
185
178
ELBOWS
Figure 14
(6)
(1) (2)
7
8
215
210
215
210
201
194
55
50
201
194
40
35
171
164
21

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