Desa (V)3612ST operating instructions Hearth Extensions, 7cm

6

FIREPLACE INSTALLATION

Framing (Cont.)

Hearth Extensions

FIREPLACE INSTALLATION

Continued

Secure fireplace to prepared framing at nailing flanges located at the sides of fireplace as shown in Figure 10.

If a hearth extensions is to be field constructed, it must be made of noncombustible inorganic material having and effective thermal conductivity “K” of 0.84 BTU In/Ft2 Hr.F or least at 1.0 inch thickness.

Thermal conductivity “K” of materials can be obtained from the manufacturer or supplier or the noncombustible material.

The minimum required thickness for any material could be obtained by the following formula:

K factor x 1.0 inch = Thickness required 0.84

If the hearth extension is to be raised, a “Z” type ember protector must be used (see Figure 8, page 5, and Figure 12).

EMBER

PROTECTOR (TYP. OF 2)

*EMBER PROTECTOR STRIPS SUPPLIED

Figure 9 - Ember Protectors

	.
	MAX
1/2"
(1	.2cm)

1/2" (1.27cm)

Minimum To

Combustibles

Nailing

Flanges

Prepared

Framing

8"	M	IN.
(20.
	3cm)

			36	1
				/
				2"
52	1		(92.		M	IN.				.
	/			7cm)					MIN
		"M
		2		IN.
(133.							16"			)
			3cm)
							(40	.6cm

NONCOMBUSTIBLE

HEARTH EXTENSION

Figure 11 - Hearth Extension

Noncombustible

Hearth Extension

8" Max.

1 1/2" Typ. “Z” Type Ember Protector

Nails or

Screws

Figure 10 - Nailing Flanges

HEARTH EXTENSIONS

A hearth extension is required to protect the combustible floor surrounding your fireplace. You may obtain kit No. HE-3612ST or

1 1/2" Typ.

Noncombustible

Hearth Extension

	K Factor	For raised
.84
		fireplace, see
		section on
		framing with a
		raised platform.

you may fabricate your own per the dimensions shown on Figure 10.

The hearth extension must project a minimum of 16 inches from the front of the fireplace and a minimum of 8 inches beyond each side of the fireplace opening (see Figure 11).

For more

Ember Protector

Figure 12 - Raised Hearth Extension

visit www..com

115603-01A