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MAX VENT LENGTHS FOR COUNTERFLOW
APPLICATION
Number of elbows
Non-direct Vent (1Pipe) System
50,000 & 75,000 BTUH
Direct Vent (2 Pipe) System
50,000 & 75,000 BTUH
APPLICATION
Number of elbows
Non-direct Vent (1Pipe) System
50,000 & 75,000 BTUH
Direct Vent (2 Pipe) System
50,000 & 75,000 BTUH
Non-direct Vent (1Pipe) System
100,000 BTUH
Direct Vent (2 Pipe) System
100,000 BTUH
Non-direct Vent (1Pipe) System
125,000 BTUH
Direct Vent (2 Pipe) System
125,000 BTUH
GENERAL LAYOUT
MODEL NUMBER
CMPB050C3B
CMPB075C3B
CMPB100C4B
CMPB125C5B
* all dimensions in inches
TOP
VIEW
Allowable Max Vent Lengths of 2" Dia. PVC, ABS or CPVC SCH 40 PIPE
1
60
60
Allowable Max Vent Lengths of 3" Dia. PVC, ABS or CPVC SCH 40 PIPE
1
80
80
65
65
50
50
UNIT DIMENSIONS
LENGTH
WIDTH
HEIGHT
A
B
29-1/2
13-1/2
47-3/8
29-1/2
13-1/2
47-3/8
29-1/2
17
47-3/8
29-1/2
20-1/2
47-3/8
"B"
"F"
BLOWER
ACCESS
PANEL
LOUVERED
ACCESS
DOOR
BURNER
ACCESS
PANEL
"D" O.D.
DOWNFLOW
2
58
55
58
55
2
3
76
73
76
73
61
58
61
58
46
43
46
43
DUCT SUPPLY
OPENING
C
D
E
11-1/2
18-15/16
11-1/2
18-15/16
15
18-15/16
18-1/2
18-15/16
ELECTRICAL
CONNECTIONS
(EITHER SIDE)
CONTROL BOX
ACCESS PANEL
THERMOSTAT
CONNECTIONS
(EITHER SIDE)
VENT CONNECTION *
"H" (FLUE DIA.)
GAS INLET
(EITHER SIDE)
CONDENSATE
DRAIN
(EITHER SIDE)
SIGHT GLASS
CONNECTIONS *
"H" (AIR INLET DIA.)
3
4
53
53
4
70
70
55
55
39
39
DUCT RETURN
CUT-OUT
F
G
12
21-5/8
12
21-5/8
15-1/2
21-5/8
19
21-5/8
"A"
"G"
7 5/16
23 1/4
VENT
EXIT
"E" O.D.
AIR INLET
5
50
50
5
65
65
50
50
35
35
AIR INLET &
VENT PIPE DIA.
H
2
2
3
3
3/4
15
"C"
1
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