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