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Heatilator • HEIR36-IFT, HEIR42-IFT, HEIR50-IFT Installation Manual • 2458-980 Rev. B • 8/17
* Adjust framing dimensions for interior sheathing (such as sheetrock)
F
H
G
I
J
E
(FROM APPLIANCE
OPENING TO CEILING)
NOTE:
2 X 4 Header positioned vertically. See also Figure 3.7.
Figure 3.9 Clearances to Combustibles (2 x 6 Construction)
* Adjust framing dimensions for interior sheathing (such as sheetrock).
** 2 x 4 material must be framed down from 2 x 6 rough opening height B’ to rough opening height B.
* MINIMUM FRAMING DIMENSIONS USING 2 X 6 CONSTRUCTION
A
B
B’
C
D
E
Rough
Opening
(Vent Pipe)
Rough
Opening
(Height)
**Rough Opening Height
Rough
Opening
(Depth)
Rough
Opening
(Width)
Clearance
to Ceiling
HEIR36
Inches
10
56
80-3/8
24
59-1/2
52
Millimeters
254
1422
2042
610
1511
1321
HEIR42
Inches
10
61
85-3/8
24
65-9/16
52
Millimeters
254
1549
2169
610
1665
1321
HEIR50
Inches
10
65
89-3/8
24
73-9/16
52
Millimeters
254
1651
2270
610
1868
1321
* MINIMUM FRAMING DIMENSIONS USING 2 X 6 CONSTRUCTION
F
G
H
I
J
Combustible
Floor
Combustible
Flooring
Behind
Appliance
Sides of
Appliance
Front of
Appliance
HEIR36
Inches
0
See Section
3.D.
1
1
36
Millimeters
0
25
25
914
HEIR42
Inches
0
1
1
36
Millimeters
0
25
25
914
HEIR50
Inches
0
1
1
36
Millimeters
0
25
25
914
A
B
D
C
B’
2 X 6 OR GREATER NOT ALLOWED IN SHADED AREA