Heatilator ST42A Installation Manual page 32

D. Mantel and Wall Projections
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WARNING! Risk of Fire!
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Combustible Wall
2 x 4 stud wall
Standoffs
Non-combustible
Decorative Facing
such as: Steel, iron,
brick, tile, concrete,
slate, tile, plasters
DO NOT cover any
air openings in the
face of the fireplace.
WARNING:
Seal joint with non-combustible
sealant to prevent heat from
being drawn into the wall cavity.
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Grid lines at 1 in. scale
Combustible
Decorative Facing
12 in./305 mm
Mantel
12 in./305 mm
6 in./152 mm
1 1/ 2 in.
38 mm minimum
maximum
Measured from top of fireplace opening
Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
WARNING!
Hearth & Home Technologies is not responsible for
discoloration, cracking or other material failures of
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7 ft (2134 mm)
minumum
base of fireplace
to ceiling
minimum