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 10.2). When creating the platform, allow for the thickness of the non-combustible finishing materials (Figure 10.5).

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

Outer Can

Fascia

 

 

 

Flange

Tile or

 

. .

 

Marble

Combustible Floor

.

 

. . .

 

Minimum 20 in. (508mm) in front and

. .

 

8 in. (203mm) on sides to fuel loading doors

.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ember Strip (Seal gap with

 

Tile or

High temp, noncombustible

Minimum 2-1/4 in. (57mm) Cement Board

Marble

sealant able to withstand

or equivalent, (or two 1/2 in. pieces)

 

300°)

and "k" value = 0.49. Micore 300

 

HX3 or HX4 Hearth Ext or equivalent insulation

(see Table below)

High temperature (300°F min.) continuous, non-combustible sealant

Tile, stone or other non-combustible material

Fireplace

Protective

Metal Hearth

Strip

Figure 10.4 Fireplace and Hearth Extension Flush on the Floor.

 

 

Outer

 

 

 

 

 

Fascia

 

 

 

 

 

 

 

 

 

 

 

 

Tile or Marble

 

 

Can

.

 

 

 

 

Combustible

 

 

Flange ...

 

 

 

 

Floor

 

 

 

 

 

 

.

 

 

 

 

Min 20 in. (508mm) in front and 8 in.

 

 

 

.

 

 

 

 

 

 

 

. .

 

 

 

 

 

 

 

 

 

 

 

(203mm) on sides to fuel loading doors

 

 

 

 

... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 

 

 

 

 

 

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 

 

 

 

 

 

 

 

 

 

 

 

3/4 in.

2 in. (51 mm)

Floor constructed of wood or required other combustible material

Figure 10.2 Hearth Extension Construction

The construction of, and materials used for a hearth exten- sion are shown in Figures 10.1 and 10.3. A hearth extension of this construction may be covered with any non-combustible decorative material and may have a maximum thickness as per Figure 10.2 Seal gaps between the hearth extension and the front of the fireplace with a bead of non-combustible sealant.

1.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 10.1 on page 54 and Figures 10.3, 10.4, and 10.5.

2 x 4

 

 

(19mm)

 

 

 

 

 

 

Plywood

Ember Strip (Seal gap

Minimum 2-1/4 in.

 

 

 

57mm) Cement

 

 

with high temp,

 

 

Board or equivalent,

2 x 4

noncombustible sealant

(or two 1/2 in. pieces)

 

 

able to withstand 300°)

 

 

and "k" value = 0.49.

 

 

 

 

 

 

Micore 300

 

 

Figure 10.5 Hearth Extension Flush on Floor but on Raised Platform

2.Fireplace is installed flush on the floor and Hearth

Extension is raised to the bottom of the fascia:

Raised hearth must be constructed of non-combustible materials such as cement block or equivalent material. Non- combustible flooring on the raised hearth must be 20 in. (508

mm)in front of and 8 in. (203 mm) to either side of the fuel opening with a minimum thickness of 1 in. (25 mm) and (“k”

value = 0.49). See Figure 10.6.

NONCOMBUSTIBLE

GAP (SEAL WITH NONCOMBUSTIBLE SEALANT)

DECORATIVE MATERIAL

 

 

 

UP TO BOTTOM OF FASCIA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6 in. (152mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1/2 in. (13mm)

 

 

 

HEARTH METAL STRIPS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(2) HX4 MICORE FACTORY

 

 

 

 

 

 

 

BUILT HEARTH EXTENSION

 

 

 

 

 

 

 

 

(Each HX4 = 1/2 in. (13mm) thick)

 

 

 

 

 

 

Figure 10.3 Side View of Factory Built Hearth Extension

 

 

Fascia

 

 

Outer

 

Min 20 in. (508mm) in front and 8 in.

 

(203mm) on sides to fuel loading doors

Tile or Marble

Can

 

 

 

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 

Flange

Non-combustible

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 

 

 

 

framing materials

 

 

 

 

Combustible Floor

 

2 x 4

 

 

3/4 in.

 

 

 

(19mm)

 

 

 

 

Plywood

Ember Strip

 

Minimum 2-1/4 in. (57mm)

 

 

(Seal gap with

Cement Board or equivalent,

 

 

noncombustible

(or two 1/2 in. pieces) and

2 x 4

 

sealant)

 

"k" value = 0.49. Micore 300

 

 

 

 

Figure 10.6 Raised Hearth Extension to Bottom of Fascia

4/20/11

Heatilator • Constitution EPA Fireplace • 480-1091D

Page 55

Page 55
Image 55
Heatiator C40 owner manual Raised Hearth Extension Framing, Fireplace and Hearth Extension are flush on the floor

C40 specifications

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