Heatilator • CST42A • 4012-012 Rev J • 08/06
11
C. Sidewalls/Surrounds
Adjacent combustible side walls must be located a minimum of 12 in. (305 mm) from the
fi
replace opening. See Figure 3.3.
If you are using a decorative surround constructed of combustible material, it must be located within the shaded area de-
fi
ned in Figure 3.3. Short stub walls are also acceptable if they are contained within the shaded area.
D. Frame the Fireplace
Figure 3.4 shows a typical framing (using 2 x 4 lumber) of the
fi
replace, assuming combustible materials are used. All re-
quired clearances to combustibles around the
fi
replace must be adhered to. See Figure 3.2. Any framing across the top of
the
fi
replace must be above the level of the top standoffs.
50 deg.
37 deg.
Brick
Front
48 in.
(1219 mm)
(framing)
42 in.
(1067 mm)
(opening)
9-3/4 in.
(248 mm)
14-3/8 in.
(365 mm)
12 in.
(305 mm)
4 in.
(102 mm)
Flush
Front
12 in.
(305 mm)
Figure 3.3 Sidewalls and Surrounds
You must maintain
2 in. (51 mm) min. air space
clearance from the
chimney to the
enclosure.
27 in.
(686 mm)
39-1/8 in. (994 mm)
Note:
Fireplace
Header cannot be
positioned until after
the fireplace assembly
is in place.
12 in. (305 mm) max.
48 in.
(1219 mm)
Figure 3.4 Framing the Fireplace