Finishing Material; Mantel; Sidewalls/Surrounds; Glass Doors - Heatilator ST42A Owner's Manual

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.
• 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.
WARNING
Fire Risk
• Use only non-combustible material below
standoffs.
• M a t e r i a l s u c h a s c e m e n t b o a r d i s
acceptable.
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
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.
12 in.
(305 mm)
max.
12 in.
(305 mm)
min.
Figure 8.4 Mantel Specifi cations
Gas
Knockout
Heatilator • ST42A • 35038 Rev G • 02/05
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
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 defi 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 specifi ed in Section 12.B. Fireplace Components. Please
refer to the manual packed with each set of doors for instal-
lation instructions.
Fire Risk
Finish all edges and fronts to clearances and
specifi 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 specifi 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.
Flush
14-3/8 in.
Front
(365 mm)
50 deg.
12 in.
(305 mm)
Figure 8.5

Sidewalls/Surrounds

WARNING
4 in.
Brick
(102 mm)
Front
42 in.
9-3/4 in.
(1067 mm)
(248 mm)
(opening)
48 in.
(1219 mm)
(framing)
12 in.
(305 mm)
37 deg.
25