Heat & Glo LifeStyle BW36 operating instructions Hearth Extensions, Factory-Built Hearth Extension

BW36 SERIES WOODBURNING FIREPLACE

No one builds a better fire

3. HEARTH EXTENSIONS.

A hearth extension must be installed with all fire- places. It is to protect the combustible floor in front of the fireplace from both radiant heat and sparks.

The construction of and materials used for a factory- built hearth extension are shown in Figure 5.

A hearth extension of this construction may be cov- ered with any non-combustible decorative material and may have a maximum thickness of 6" for the BW36 and 3” for the BW36C. Seal gaps between the hearth extension and the front of the fireplace with a non-combustible sealant.

NON-COMBUSTIBLE		GAP (SEAL WITH NON-COMBUSTIBLE SEALANT)
DECORATIVE MATERIAL
		BLACK FIREPLACE BOTTOM
1/2"	HX3 FACTORY-BUILT		BW36-6"
		HEARTH SEALING STRIP
	HEARTH EXTENSION		BW36C-3"

Figure 5

Factory-Built Hearth Extension

Field constructed Hearth Extensions should be constructed in accordance with the minimum dimensions provided in Figure 6.

NON-COMBUSTIBLE DECORATIVE COVERING OR .018 MIN. SHEET METAL

INSULATION MIN. R VALUE 1.16

EXAMPLES OF INSULATION

REQUIRED

THICKNESS K VALUE

USG MICORE CV230 1/2" 0.43

(THERMAL CONDUCTIVITY) "K" = BTU in./hr. ft2 °F

TO SUBSTITUTE ALTERNATE INSULATION MATERIAL, YOU NEED TO KNOW THE "K" FACTOR FOR THAT MATERIAL. TO CALCULATE THE REQUIRED THICKNESS FOR THE ALTERNATE MATERIAL USE THE FOLLOWING FORMULA:

52"16"

K ALT.
	x .5 = THICKNESS OF ALTERNATE MAT. (INCHES)
.43

EXAMPLE:“K” OF BRICK = 5

5

x .5 = 5.81 IN. OF BRICK.

.43

Figure 6

Hearth Extension

WARNING!

HEARTH EXTENSIONS ARE TO BE INSTALLED ONLY AS ILLUSTRATED

TO PREVENT HIGH TEMPERATURES FROM OCCURRING ON CON-

CEALED COMBUSTIBLE MATERIALS. HEARTH SEALING STRIPS PRE-

VENT BURNING OR HOT PARTICLES FROM INADVERTENTLY FALLING

DIRECTLY ON COMBUSTIBLE SURFACES IN THE EVENT THE BUILDING

SHOULD SETTLE AND DISTURB THE ORIGINAL CONSTRUCTION.

4-00 10 30491D