Hearth Extension, Non-Combustible Sealant Material

1in. (25mm) OVERLAP

		in. (51mm) under edge of
	Metal strips 2
	Fireplace and Hearth Extension and 2 in.
	(51mm) on both side of fireplace opening.
Figure 10.1	Nail or screw metal strips in place.

Top	Apply bead of
Board	Super Calstick to
	edge here
Side
Board
Bottom
Board	Side
	Side
	Board
Figure 10.2

•Non-Combustible Sealant Material

Sealants which will not ignite and burn: Super Calstick

After completing the framing and applying the facing mate-

rial (drywall) over the framing, a bead of non-combustible sealant must be used to close off any gaps at the top and sides between the fireplace and facing to prevent cold air leaks. Large gaps can be bridged with fiberglass rope gas- ket.

Only non-combustible materials may be used to cover the metal fireplace front.

•Cardboard OR Metal Template

A cardboard template of the front is printed on the outside of the shipping box. It measures 1/8 in. (3 mm) bigger all the way around than the actual front. Cut out the template along the outside of the line for use in your installation.

A metal template is also available for more durable continued use remaining accurate over time. See page 64 for catalog number.

Warning Fire Risk! Maintain clearances

Use only non-combustible material below standoffs, mate- rial such as cement board is acceptable.

Framing or finishing material used on the front of, or in front of, the appliance closer than the minimums listed, must be constructed entirely of non-combustible materials (i.e., steel studs, concrete board, etc.).

WARNING! Fire Risk

Hearth & Home Technologies is not responsible for discol- oration, cracking or other material failures of finishing ma- terials due to heat exposure or smoke.

Seal with non-combustible sealant

Figure 10.3

Figure 10.4 Complete installation

•Choose finishing materials carefully.

D. Hearth Extension

WARNING! Risk of fire! High temperatures, sparks, embers or other burning material falling from the fireplace may ignite flooring or concealed combustible surfaces.

•Protective metal hearth strips MUST be installed.

•Hearth extensions MUST be installed exactly as specified.

•You MUST use a hearth extension with this fireplace.

•Refer to Figure 10.5 for minimum dimensions.

•This fireplace has been tested and approved for use with a hearth extension insulated to a minimum R value of 2.18.

•The hearth extension material MUST be covered with tile, stone or other non-combustible material.

•Manufactured hearth materials will usually have a published R value (resistance to heat) or k value (conductivity of heat). Refer to the formula in Table 10.1 to convert a k value to an R value,

•Refer to Table 10.2 for hearth extension insulation alternatives.

4/12

Heatilator • Constitution EPA Fireplace • 480-1091H

Page 55

C40 specifications

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