Heatilator ST42A Installation Manual page 12

D. Frame the Fireplace
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platform.
WARNING! Risk of Fire!
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• A minimum 1/2 in. (13 mm) air clearance must be
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• Chimney sections at any level require a 2 in. (51 mm)
minimum air space clearance between the framing and
chimney section.
WARNING! Risk of Fire!
mum air space clearances to combustibles. DO NOT pack
required air spaces with insulation or other materials.
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CAUTION! Risk of Cuts/Abrasions. Wear protective gloves
and safety glasses during installation. Sheet metal edges
are sharp.
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E. Secure and Level the Fireplace
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12
Comply with all minimum clear-
You must comply with all mini-
Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
WARNING! Risk of Fire!
loose insulation.
• DO NOT install against vapor barriers or exposed
insulation.
• Secure insulation and vapor barriers.
• Provide minimum air space clearances at the sides and
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17 in. (368 mm)
framing
3-1/2 in.
(89 mm)
3-1/2 in.
(89 mm)
(1219 mm)
27 in.
(686 mm)
Figure 3.5 Framing the Fireplace
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Prevent contact with sagging,
Fireplace must be set out
1/2 in. (13 mm) in front of
1/2 in.
the face of the framing
(13 mm)
12 in. (305 mm) max.
Note: Fireplace
header cannot be
positioned until after
the fireplace assembly
is in place and set on
edge. The 2 x 4s above
the header will lay flat.
48 in.