Heatilator CST42A, Owner'S Manual, Page: 26 / 48

Heatilator • CST42A • 4012-012 Rev J • 08/06
26
B. Finishing Material
• Combustible Material
Material which is made of or surfaced with wood,
compressed paper, plant fi bers, plastics, or any material
capable of igniting and burning, whether fl ame proofed or
not, plastered or not plastered.
• Non-Combustible Material
Material which will not ignite and burn. Such materials are
those consisting entirely of steel, iron, brick, tile, concrete,
slate, glass or plasters, or any combination thereof.
Materials that are reported as passing
ASTM E 136,
Standard Test Method for Behavior of Materials in a
Vertical Tube Furnace at 750° C
, shall be considered
non-combustible materials.
• Non-Combustible Sealant Material
Sealants which will not ignite and burn: Rutland, Inc.
Fireplace Mortar #63 (or equivalent).
After completing the framing and applying the facing material
(drywall) over the framing, a bead of non-combustible seal-
ant must be used to close off any gaps at the top and sides
between the
fi replace and facing to prevent cold air leaks.
Large gaps can be bridged with fi berglass rope gasket.
Only non-combustible materials may be used to cover the
metal
fi replace fronts.
openings. See Figure 8.4. Combustible trim must not cover
the metal surfaces of the
fi replace. This mantel clearance is
in accordance with Section 7-3.3.3 of ANSI/NFPA211 .
D. Sidewalls/Surrounds
Adjacent combustible side walls must be located a minimum
of 12 in. (305 mm) from the
fi replace opening. If you are us-
ing a decorative surround constructed of combustible ma-
terial, it must be located within the shaded area de
fi ned in
Figure 8.5. Short stub walls are also acceptable if they are
contained within the shaded area.
E. Glass Doors
This fi replace has been tested and listed for use with doors
as speci fi ed in Section 12.B. Fireplace Components. Please
refer to the manual packed with each set of doors for instal-
lation instructions.
12 in.
(305 mm)
max.
12 in.
(305 mm)
min.
Gas
Knockout
3,!
&LUE
!DAPTER
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 8.5 Sidewalls/Surrounds
Fire Risk
• Use only non-combustible material below
standoffs.
• Material such as cement board is
acceptable.
WARNING
Fire Risk
Do NOT obstruct air inlet or outlet grilles.
Do NOT modify grilles.
• Modifying or covering grilles could cause
temperature rise and fi re hazard.
Finishing materials must not interfere with:
• Air
fl ow through grilles or louvers
• Operation of louvers or doors
• Access for service
WARNING
Fire Risk
Finish all edges and fronts to clearances and
speci
fi cations.
• Metal fi replace front may be covered with
non-combustible material only.
• Do NOT overlap combustible materials onto
fi replace fronts.
• Install combustible materials up to speci fi ed
clearances on top, front and side edges.
• Seal joints between the fi nished wall and
fi replace top and sides using only a 300° F
minimum sealant.
WARNING
C. Mantel
A combustible mantel may be positioned no lower than
12 in. (305 mm) above the top of the
fi replace openings. The
combustible mantel may have a maximum depth of 12 in.
(305 mm). Combustible trim pieces that project no more than
1 in. (25 mm) from the faces of the
fi replace can be placed
no closer than 6 in. (152 mm) from the top of the fi replace
Figure 8.4 Mantel Speci fi cations