Fireplace Installation

Continued

Note: For outdoor installations, fireplace enclosure must allow for adequate drainage and fresh air ventilation. It is recommended that a sealed, corrosion resistant catch pan with provision for drainage be installed under fireplace within fireplace enclosure.

Hearth Extension

A hearth extension projecting a minimum of 20" in front of and a minimum of 12" beyond each side of fireplace opening is required to protect combustible floor construction in front of fireplace. Fabricate a hearth extension using a material which meets the following specifications: a layer of noncombustible, inorganic material having a thermal conduc- tivity of K=0.84 BTU IN/FT, HR. F (or less) at 1" thick. For example, if the material selected has a K factor of 0.25, such as glass fiber, the following formula would apply:

0.25x 1.0" = 0.30" thickness required

Thermal conductivity "K" of materials can be obtained from manufacturer or supplier of noncombustible material. If hearth extension is to be covered, use noncombustible mate- rial such as tile, slate, brick, concrete, metal, glass, marble, stone, etc. Provide a means to prevent hearth extension from shifting and seal gap between fireplace frame and hearth extension with a noncombustible material (see Figure 6).

WARNING: Hearth extension

is to be installed only as shown

in Figure 6.

Seal Gap

Fireplace Front

Ember Protector

Fireplace Front

 

Raised Hearth

 

Ember Protector

Hearth

 

 

Extension

Fireplace Front

Seal Gap

Elevated

 

Ember Protector

 

Mantels

A mantel may be installed if desired (see Figure 7). Woodwork such as wood trims, mantels or any other combustible material projecting from front face must not be placed within 12" (36" Models) or 18" (42/50" Models) of fireplace opening. Combustible materials above 12" (36" Models) or 18" (42/50" Models) and projecting more than 1 1/2" from fireplace must not be placed less than 15" (36" Models) or 21" (42/50" Models) from the top opening of the fireplace (NFPA STD 211, Sec. 7-3.3.3).

Mantels or any other combustible material also may come up to side edge of black metal face of fireplace as long as projections from front face fall within limit shown in Figure 7.

 

 

12 1/4" Ref.

Combustible

 

 

Material

 

 

 

Safe

 

 

 

Zone for

6"

 

Projection of

 

Combustible

Ref.

33°

Materials

 

 

Min.15"(36" Models)

 

3" Nom.

 

Min.21" (42/50" Models) Min.12" Models)(36" Min.18" (42/50" Models)

 

 

 

11/2" Max.

 

 

 

 

Upper

 

 

 

Section of

 

 

 

Fireplace

 

 

Fireplace Opening

 

Top View of Fireplace

7.75" (36" Models)

FIREBOX

 

11.5" (42/50" Models)

 

 

 

3" Max.

SAFE ZONE

4.5"

Combustible

33°

Material

 

Must Not

Min. to

 

 

Overlap

Perpendicular

 

Front Face

Side Wall

 

 

12" - 36" Models

 

 

18" - 42/50" Models

 

Figure 7 - Mantel Clearances to

Combustible Material

 

Figure 6 - Hearth Extension

122273-01Awww.desatech.com

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Desa WCM-50J, WCM-36J, WCM-42J, (V)JM36, (V)JM50 SERIES installation manual Hearth Extension, Mantels
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(V)JM36, (V)JM50 SERIES, WCM-36J, WCM-50J, WCM-42J specifications

The Desa WCM-50J, WCM-36J, and WCM-42J are part of the (V)JM50 series and (V)JM36 series, renowned for their versatility and efficiency in various applications. These models are designed to meet the dynamic needs of modern users, providing reliable performance in multiple operating conditions.

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