Vermont Casting BC42, BR42, BC36, BR36 manual Example of Determining Hearth Extension Equiva- lents

Page 17

WARNING: HEARTH EXTENSION MUST BE IN- STALLED 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

Noncombustible 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. 24 Hearth extension material factors.

Wall Covering

 

Noncombustible

2x4" HEADER -

Decorative

Do not notch at

Facing

standoffs.

Seal all cracks

 

between fireplace

 

surround and wall

 

materials with

 

noncombustible

 

material.

 

Noncombustible

 

Decorative

 

Covering

 

Hearth

Seal crack

Extension

between fireplace

Insulation

and hearth extension

 

with noncombustible

 

material.

Side View

Safety Strips -

 

Must be overlapped

FP550

���" minimum.

Fig. 25 Sealing gaps.

 

Majestic Fireplaces® BR/BC Series

Example of Determining Hearth Extension Equiva- lents

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)

mate-

rial

 

 

Example for Common Brick

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

Recessed Installation - BR/BC36 Only

Noncombustible

 

 

 

Material

Minimum

 

(if desired)

 

36” (914 mm) A

 

 

 

Insulation

 

 

 

with Minimum

 

6”

 

R Value

 

 

 

(152 mm)

Minimum

of 2.75

 

 

Minimum

 

 

33”

 

 

 

 

 

 

(838 mm)

 

2”

2”

 

 

(51 mm)

(51 mm)

 

 

Hearth Extension

 

 

 

A

 

 

Minimum .030 Thick Stain-

 

 

less Steel Plate

 

 

 

Insulation with Minimum R

 

 

Value of 2.75

 

 

 

Minimum .030

 

Maximum

 

Thick Stainless

 

10”

 

Steel Plate

 

(254 mm)

 

 

 

Maximum

14” (356 mm)

Hearth

FP1608

Extension

 

View A

NOTE: If noncombustible material is not used between the stainless steel plate and fireplace opening, the steel must be attached to the front of the unit a minimum of four (4) places on each piece with sheet metal screws no longer than 1/2".

NOTE: The size of the insulation and stainless steel plate must be within limits stated above and covers all combustible framing material.

Fig. 26 Recessed installation.

7412944

17

Image 17
Contents BR/BC Series Table of Contents Safety Information451162mm 45 1162mm 13mm BR42 Series specifications and framing BR42 Series Woodburning FireplaceFront Width Back Width Depth Chase InstallationIllustration Key 30˚ Elbow OffsetsMounting the Fireplace Planning InformationPlanning the Chimney Run Ten Foot RuleChase Installation InstallationChimney Supports Insulating Fireplace Enclosure for Cold ClimatesInstall Fan Kit Assembly Installing Electrical Wire For Circulator ModelsFraming Option For Circulating Models OnlyOffset Installation Straight-Up Chimney InstallationCeiling Chimney Hole Possible Obstructions Cutting the HoleInstalling Outside Air Kit Positioning, Safety Strips Securing the FireplaceProper Firestop Spacer Installation Installing the Chimney SystemInstalling the Firestop Spacer Ceiling Hole Canadian Requirements for Insulation Shield Continue Installing Pipe to Complete RunAdditional Ceilings Penetrating the RoofInstalling Top Housing Or Termination Install Remainder of Chimney SectionsInstalling Chimney In a Chase Finishing Finish WallFacing Material Examples of wall shield insulation Hearth InstallationSide Wall Protection Example for Common Brick Recessed Installation BR/BC36 OnlyExample of Determining Hearth Extension Equiva- lents Gas line access Installing Line For Gas LogItem/Model Number BR/BC Series42GDKDP BR/BC42 AccessoriesRLTSK8 Chimney ComponentsChimney Components cont. Canada For Majestic Fireplaces PRE-ENGINEERED Fireplace Systems Limited Warranty & 30 Year Protection PlanCFM Corporation
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BC36, BC42, BR36, BR42 specifications

Vermont Castings is renowned for its high-quality, American-made gas stoves, particularly the BR36, BR42, BC42, and BC36 models. These gas-burning appliances are engineered to provide warmth and comfort while seamlessly blending into any home décor.

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