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Heatilator • GBST4336I, GBFL4136I • 2135-900 Rev. D • 11/08
C
A
B
D
* Adjust framing dimensions for interior sheathing (such as sheetrock)
**See pipe manufacturer’s installation instructions
MINIMUM FRAMING DIMENSIONS*
GBFL4136I
ABC*DE F GHI
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 ** 38-1/8 23 40 31-5/8 0 0 1/2 36
Millimeters ** 968 584 1016 803 0 0 13 914
E
G
H
I
F
I
Figure 5.3 Clearances to Combustibles, Model GBFL4136I