Vermont Casting BFC36 Side Wall Protection, Hearth Installation, Minimum Wall Clearances, 7412647

Side Wall Protection

BFC36 Balance Flue Heat-Circulating Fireplace

Hearth Installation

Adjacent combustible side walls that are within mini- mum dimensions shown in Figure 24 of the fireplace opening must be protected with CFM Corporation Wall Shield Model SP40 or a specifically built wall shield described in Figure 18.

The special wall shield design described in Figure 18 is an alternate method of adding protection to side walls and can be used in place of the SP40 with the same wall clearances specified for the SP40. Rt must =1.85 minimum.

Examples of wall shield insulation:

1.Manville - CERAFORM 126, K=.27, 1/2 inches thick

2.EH2416, K = .458,

1 inch thick required.

A hearth extension is required to protect a combustible floor in front of the fireplace. Refer to Figure 21 for mini- mum dimensions and mounting detail.

Note: Hearth Extension must not cover the air inlet opening of a fireplace.

The hearth extension described in Figure 21 must be a durable non-combustible material with a minimum (total) Rt value of 1.09; refer to Figure 22 for examples. The overall height (above a combustible floor), depth and width must be as indicated, with the extension cen- tered to the fireplace opening.

The top of insulation must be covered with a non-com- bustible decorative covering or a piece of .018” mini- mum sheet metal, to protect hearth extension material.

(Fig. 21)

Secure the hearth extension to the floor to prevent shifting, using trim molding or other similar means at three (3) outer edges. Seal crack between the fireplace hearth and hearth extension with a non-combustible

material. (Figs. 21 and 23)

Minimum Wall Clearances

WITH	WITHOUT
Noncombustible	Noncombustible
Surround Facing	Surround Facing
	Shaded area
4" Brick	starts 1/2" from
	away from edge
(Example material)
	of unit	4"
E F**	Firebox	E D
	Opening
C**	A - Min. clearance
	to combustible
Side	perpendicular wall
	B - Min. clearance	Side
Wall	to combustible	Wall
	perpendicular wall when
	using noncombustible wall shield*

Combustible material permitted within shaded area.

*Noncombustible wall shield requires 1" EH2416 insulation (minimum R Value = 1.85) between decorative noncombustible rigid covering and combustible wall. Minimum height and width is 40" x 40".

**Dimension/degree of angle will vary depending on thickness of noncombustible surround facing.

Minimum Hearth Extension Dimensions

(for On-Site Construction)

	H	G	G
			J
	Seal cracks
May install	between the
noncombustible	fireplace
decorative	and hearth
covering	extension with
OR .018" min.	noncombustible
sheet metal	material		Fireplace
			Hearth
4" MIN.
Combustible	Minimum		Safety strips
Floor	Insulation		must overlap
	Value "R"		���" minimum

	A	B	C	D	E	F	G	H	J
BFC36	26”	12”	17°	25°	12”	8”	8”	18”	47¹⁄₄”	FP594b
	660mm	305mm			3085mm	203mm	203mm	457mm	1200mm

Fig. 21 Combustible side wall protection and hearth extension dimensions.

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