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unit and accessorY dimensions
mdB/mrB 120-130 dimensions
C L
2
C L
P
B + 6
G
B + 3
B
GAS MANIFOLD
COMPARTMENT
C L
SERVICE ACCESS
DOORS BOTH SIDES
PIPING COMPARTMENT
LOUVERS
VENT CONNECTION
2
GAS CONNECTION
A
1 1/16
6
P
"DETAIL A"
CASING
BASE PAN
BASE FRAME
13/16
1/8
4
3
3 1/2
1 1/16
BASE O.D.
CASING O.D.
table 35.1 - Filter Quantity / size (inches)
Filter location
model
inlet hood
size
120
122
(9) 20 x 25 x 2
124
125
(6) 20 x 25 x 2
127
(9) 16 x 25 x 2
130
table 35.2 - mdB / mrB unit dimensions (all dimensions in inches)
model
a
B
c
size
120
48
78
96
122
48
78
96
124
48
78
96
125
60
92
110
127
60
92
110
130
60
92
110
Note: All accessories shipped completely assembled for easy installation. Some accessories shipped separately. All data subject to change.
All dimensions subject to manufacturing tolerances.
C L
C - 3
6
F
Q
D
BLOWER
F
MOTOR
ELECTRICAL
COMPARTMENT
UNIT
C
R
E
E
3
SEE
'DETAIL A'
S
v-Bank section
(12) 20 x 25 x 2
(10) 20 x 20 x 2
(10) 20 x 25 x 2
d
e
F
24 7/8 24 7/8 18 9/16
59
27 3/8 27 3/8 17 5/16
59
28 3/8 31 3/8 16 13/16
59
31 3/8 31 3/8 22 5/16
73
34 3/8 34 3/8 20 13/16
73
36 7/8 36 7/8 19 9/16
73
(4) 1" DIA. LIFTING HOLES
1 1/2
L
1 1/2
FLAME
VIEWPORT
OPTIONAL
DISCHARGE
DAMPER
3/4
1 1/2
M
1 1/2
21 1/4
OPTIONAL
INLET HOOD
WITH BIRDSCREEN
OPTIONAL FILTER
ARRANGEMENT
1 1/16
N
1 1/16
G
h
J
K
1 5/16
1 1/2
1 3/4
31 1/2
1 5/16
1 1/2
1 3/4
31 1/2
1 5/16
1 1/2
1 3/4
31 1/2
1 1/16
1
2 1/4
41 1/2
1 1/16
1
2 1/4
41 1/2
1 1/16
1
2 1/4
41 1/2
7-500.10
1 1/2
L
1 1/2
OPTIONAL THREE
WAY DISCHARGE
LOUVER
1 1/2
M
24
1 1/2
J
2
B + 6
B
B
2
J
FILTER ACCESS DOOR
OPTIONAL
INLET
DAMPER
1 1/16
K
A
A
A
1 1/16
K
9
l
m
n
P
31
45 3/8
14
31
45 3/8
14
31
45 3/8
14
42
56
20
42
56
20
42
56
20
OPTIONAL
V-BANK
FILTER
24
3
Q
r
s
55
2 1/4
11 1/4
55
2 1/4
12 1/4
55
2 1/4
13 1/4
69
2 1/4
13 1/4
69
2 1/4
15 1/4
69
2 1/4
16 1/4
35
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