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Heatilator • ST42A Installation Manual • 4012-051 • Rev C • 10/03/13
D. Mantel and Wall Projections
A combustible mantel may be positioned no lower than
42 1/2 in. (1079 mm) from the base of the fireplace.
The combustible mantel may have a maximum depth of
12 in. (305 mm). 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
or side of the decorative front. Combustible trim must not
cover:
• the metal surfaces of the fireplace
• where the non-combustible board is placed over the
metal surfaces
• the space between the metal face of the fireplace and
framing members
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
6 in./152 mm
minimum
12 in./305 mm
minimum
Combustible
Decorative Facing
Non-combustible
Decorative Facing
such as: Steel, iron,
brick, tile, concrete,
slate, tile, plasters
Seal joint with
non-combustible
sealant
Figure 7.10 Mantel Specifications