Heatiator C40 owner manual Position the Hearth Extension, Raised Hearth Extension Framing

8 in. (203mm)

from each side of fuel loading door

BA

Model #		A	B
Constitution
	in.	41	20
	mm	1041	508

Figure 10.5 Hearth Extension Dimension

1. Position the Hearth Extension

Position and secure the hearth extension over the protective metal strips that have been placed partially under the fireplace front. These strips should be protruding approximately 2 in. (51 mm) from under the fireplace front and 2 in. (51 mm) on both sides of the fireplace opening. See Figure 10.6.

Seal the crack between the hearth extension and fireplace with a bead of non-combustible sealant. See Figure 10.12. Apply a non-combustible finishing material of your choice to the hearth extension.

NOTICE: see pages 36-37 and 55, “clearances to combus- tibles, hearth extensions / floor protection” for clearances required for different hearth extension installations. The clearances must be strictly adhered to.

Pallet	1 in. (25mm) Overlap
Mounting
Brackets

Protective metal strips are placed 2 in.(51mm) under the front of the fireplace and must extend beyond the front and sides of fireplace opening by 2 in. (51mm). Nail or screw metal strips in place.

Figure 10.6 Positioning the Protective Metal Hearth Strips

Warning! Fire Risk!

Hearth extensions are to be installed only as illustrated to prevent high tempertures from occurring on concealed combustible materials.

Hearth sealing strips prevent burning or hot particles from inadvertently falling directly on combustible surfaces in the event the building should settle and disturb the original construction.

Raised Hearth Extension Framing

The hearth framing must be constructed of non-combusti- ble materials (Table 10.2) and placed on an HX3 or HX4, or equivalent material (Figure 10.7). When creating the platform, allow for the thickness of the non-combustible finishing materials (Figure 10.10).

IMPORTANT! Hearth extension design must be determined before installation of fireplace.

	High temperature
	(300°F min.) continuous,
2 thickness of HX4	non-combustible sealant
Hearth Ext			Fireplace
or equivalent insulation	Tile, stone or other
(see Table below)	non-combustible material			Protective
				Metal Hearth
				Strip
		2 in. (51 mm)
Floor constructed of wood or		required
other combustible material

Figure 10.7 Hearth Extension Construction

The construction of, and materials used for a hearth exten- sion are shown in Figures 10.5 and 10.8. A hearth extension of this construction may be covered with any non-combustible decorative material and may have a maximum thickness as per Figure 10.7 Seal gaps between the hearth extension and the front of the fireplace with a bead of non-combustible sealant.

2.Fireplace and Hearth Extension are flush on the floor:

Non-combustible flooring 20 in. (508mm) in front of and 8 in. (203mm) to either side of the fuel opening with a minimum thickness of 1 in. (25mm) and (“k” value = 0.49). See Figure 10.5 on page 54 and Figures 10.8, 10.9, and 10.10.

NONCOMBUSTIBLE	GAP (SEAL WITH NONCOMBUSTIBLE SEALANT)
DECORATIVE MATERIAL
	UP TO BOTTOM OF FASCIA	6 in. (152mm)
1/2 in. (13mm)
(2) HX4 MICORE FACTORY	HEARTH METAL STRIPS
BUILT HEARTH EXTENSION
(Each HX4 = 1/2 in. (13mm) thick)

Figure 10.8 Side View of Factory Built Hearth Extension

Page 56 Heatilator • Constitution EPA Fireplace • 480-1091H 4/12