6
GCUF/GRUF Vent-Free Fireboxes
Monessen • GCUF/GRUF Owner Manual • 71D0530 • Rev G • 01/20
FIREBOX DIMENSIONS
2
¹⁄₂
”
B
2
¹⁄₂
”
A
Rough
Opening
Height
D
F
C
Rough
Opening
Depth
M - Rough Opening Width
1/2” - 5/8”
O
Q
P
P
R
710530
GCUF dims
I
1
¹⁄₄
”
6”
1
⁵⁄₁₆
”
5
⁷⁄₁₆
”
N
21
³⁄₄
”
E
H
J
L
G
K
34
³⁄₄
”
Ref.
GCUF32C/GRUF32C
GCUF36C/GRUF36C GCUF42C/GRF42C
A
37"
41"
47"
B
32"
36"
42"
C
16"
18"
18"
D
29"
32"
38"
E 18
5
⁄
8
" 20
5
⁄
8
"
20
5
⁄
8
"
F 23
3
⁄
8
" 27
3
⁄
8
"
33
3
⁄
8
"
G 13
1
⁄
4
" 15
3
⁄
4
"
15
3
⁄
4
"
H
18" 17
5
⁄
8
"
17
5
⁄
8
"
I 29
7
⁄
8
" 34"
40"
J 7
1
⁄
8
" 9
3
⁄
4
"
9
3
⁄
4
"
K
8"
8
1
⁄
4
"
8
1
⁄
4
"
L 2
3
⁄
4
" 2
1
⁄
4
"
2
1
⁄
4
"
M 37
1
⁄
4
" 41
1
⁄
4
"
47
1
⁄
4
"
N
35"
35"
35"
O 15
1
⁄
2
" 17
1
⁄
2
"
17
1
⁄
2
"
P 43
3
⁄
4
" 48
3
⁄
4
"
53"
Q 61
3
⁄
4
" 68
7
⁄
8
"
74
7
⁄
8
"
R 30
7
⁄
8
" 34
1
⁄
2
"
37
1
⁄
2
"
Figure 1 -
Firebox and Framing Dimensions
