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Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev P • 09/28/15
E. Mantel and Wall Projections
The combustible mantel may have a maximum depth of 12
in. (305 mm). Positioned 22 in. (559 mm) above the open-
ing. Combustible trim pieces that project no more than
1-1/2 in. (38 mm) from the face of the fireplace can be
placed no closer than 6 in. (152 mm) from the top of the
opening.
7 ft (2134 mm)
minimum
base of fireplace
to ceiling
Combustible Wall
2 x 4 stud wall
Standoffs
Measured from top of fireplace opening
12 in./305 mm
1 1/2 in./38 mm
maximum
Mantel
22 in./559 mm
minimum
Combustible
Decorative Facing
Seal joint with
non-combustible
sealant
6 in./152 mm
minimum
12 in./305 mm
minimum
Grid represents
1 in. squares
Non-combustible
Decorative Facing
such as:
Steel, iron, brick,
tile, concrete, slate,
glass, plasters.
Figure 7.13 Mantel Specifications
18 1/2 in. [470 mm]
19 3/4 in. [500 mm]
4 in.
[102 mm]
50° angle
39° angle
24 in.
[610 mm]
BRICK
FRONT
FLUSH
FRONT
24 in.
[610 mm]
22 3/8 in. [568 mm]
52-7/8 in. (1343 mm)
42 in.
[1067 mm]
Note: Grid depicts 1 inch squares.
Figure 7.12 Mantel Leg, Surround or Wall Projection (acceptable
on both sides of opening)
D. Sidewalls/Surrounds
• Locate adjacent combustible sidewalls a minimum of 24
in. (610 mm) from fireplace opening.
• Mantle leg, surround, stub wall, whether combustible
or non-combustible, may be constructed as shown in
Figure 7.12.
