12 MCP15-500.7
GAS HEATING OPTION VENT TERMINALS AND COMBUSTION AIR HOODS
Vent Terminals and Combustion Air Hoods
1. Do not operate the units without the factory supplied (shipped
loose) power exhauster vent system/vent termination(s) or
combustion air hoods if applicable. Refer to Table 12.1 to
determine how many terminals and hoods are required based
on the model MPR nomenclature.
2. Do not modify or obstruct the combustion air inlet louvers or
the power exhauster discharge cover terminations.
3. Do not add any vents other than those supplied by the
manufacturer. For units that require vent extension kits, refer
to Literature #MCP15-574, “Installation Instructions,
Extended Vent Kit, Model MPR Gas Heat”.
Figure 12.1 - Power Exhauster Vent Terminal for
Non-Condensing Gas Furnace Option
Gas Furnace
Vent Outlet
(6) Screws for
Fastening Gas
Furnace Vent
Outlet Cover
(supplied with kit)
Note: Caulk mating
surfaces before
attaching to the unit
k C-Cabinet sized unit shown with two vent terminals. B-Cabinet sized units
have only one and D-Cabinet with have either one on each side of the
cabinet (two total) or two on each side of the cabinet (four total).
2
F 150,000
G 200,000
H 250,000
J 300,000
K 400,000
R 175,000
S 225,000
T 310,000
J 300,000
K 400,000
L 500,000
L 600,000
U 350,000
V 450,000
K 400,000
L 500,000
M 600,000
Q 800,000
1 900,000
2 1,000,000
3 1,200,000
4 1,400,000
5 1,600,000
Non-
Condensing
Condensing
Non-
Condensing
Condensing
Non-
Condensing
Non-
Condensing
n/a
1 n/a
2
2
n/a
n/a
Digit
2 2
4 2
B
C
Furnace
1
D
Furnace Size
Digit
Table 12.1 - Power Exhauster Vent Terminal and
Combustion Air Hood Quantity
Non-Condensing Furnaces (B, C, or D-Cabinet)
For Non-Condensing furnace types, as determined from Table
12.1, refer to Figure 12.1 for vent termination installation details,
otherwise skip to the section titled Condensing Furnaces. For
units that require vent extension kits, refer to Literature
#MCP15-574, “Installation Instructions, Extended Vent Kit,
Model MPR Gas Heat”.
For D-Cabinet units, the furnace doors must have the
combustion air hoods field installed as shown in Figure 12.2,
using the screws included with the kit. Once complete, proceed
to the “Start-Up” section.
Figure 12.2 - Combustion Air Hood Installation
(D-Cabinet only)
For specific instructions on each configuration in Table 12.1,
refer to the appropriate section from the following sections
titled:
• Non-Condensing Furnaces (B, C, or D-Cabinet), or
• Condensing Furnace (B-Cabinet), or
• Condensing Furnace (C-Cabinet)
Also shown are the vent terminals for reference.
Note: Caulk mating surfaces
before attaching to the unit.
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