Vermont Casting 647 BFC Finish Glass Doors, BFC36 Balance Flue Heat-CirculatingFireplace, 7412647

BFC36 Balance Flue Heat-Circulating Fireplace

WARNING: Hearth extension must be installed in accordance with Figure 23 and must not cover the bottom front opening of the circulating model.

Alternate noncombustible materials may be used pro- viding the (total) thermal resistance (Rt value) of the al- ternate material employed is greater than or equal to R

=1.09 Thermal resistance (R) or thermal conductivity (K), may be obtained from manufacturer of the material. Factors are related by the formula K = 1/R. (Fig. 24)

T = given thickness

R = thermal resistance for a given thickness (T) K = thermal conductivity

Non-combustible material with a lower R value may be used, provided thickness of material is sufficiently greater to maintain an equivalent (total) thermal resis-

tance (Rt).

COMMON MATERIALS AND FACTORS

MATERIAL	K*	R	MINIMUM
			THICKNESS
EH2416	0.458	1.09	0.50 in.**
(CFM Corporation)
Common Brick	5.0	0.10	5.46 in.**

R Value is for 1/2 inch.

*Units of K = BTU/SQ FT/HR/˚F/IN ** Thickness of Listed Material

FP533ADD

Fig. 22 Hearth extension material factors.

Example of Determining Hearth Extension Equivalents

To determine the thickness required for any new mate- rial:

NEW		K of new material (per inch)	thickness
required	=	--------------------------------------- X	of listed
thickness		K of listed material (per inch)	material

Example for Common Brick

T (new) = 5.0/0.458 x 0.50 in. = 5.46 in. (new required thickness).

Wall Covering			Side View
Noncombustible			2 x 4” Header
Decorative Fac-			- Do not notch at
ing			standoffs
Seal all cracks
between fireplace
surround and wall
materials with non-
combustible material.
Noncombus-
tible Decorative
Covering
Hearth Exten-		Seal crack between
		fireplace and hearth
sion Insulation
		extension with noncom-
		bustible material
	Safety Strips -
	Must be overlapped 1/2”
FP550	minimum
Fig. 23 Sealing gaps.

Finish Glass Doors

The fallaway handles are used to open and close the front doors. The fallaway handles may be removed after each use or may be left in place. CAUTION: If the handles are left in place during operation, they may become hot. (Fig. 24)

Adjust door alignment by loosening the phillips head screws which secure the door hinges to the door. Adjusting one hinge while leaving the other tight will serve to rotate the inner edge up or down. Adjusting both hinges at the same time allows the door to adjust side-to-side.

Steel Handle

Fallaway

Handle

FP1584

Fig. 24 Insert fallaway handle into steel handle.

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