
Heatilator • GBST4336I, GBFL4136I • 2135-900 • 2/08
18
C
A
B
D
* Adjust framing dimensions for interior sheathing (such as sheetrock)
**See pipe manufacturer’s installation instructions
MINIMUM FRAMING DIMENSIONS*
GBFL4136I
A
B
C*
D
E
F
G
H
I
Rough
Opening
(Vent Pipe)
Rough
Opening
(Height)
Rough
Opening
(Depth)
Rough
Opening
(Width)
Clearance
to Ceiling
Combustible
Floor
Combustible
Flooring
End of
Appliance
Sides of
Appliance
Inches
**
38-1/2
23
41
31-5/8
0
0
1/2
36
Millimeters
**
978
584
1041
803
0
0
13
914
E
G
H
I
F
I
Figure 5.3 Clearances to Combustibles, Model GBFL4136I