Fireplace Installation

Continued

Hearth Extension

A hearth extension projecting a minimum of 20" in front of and a minimum of 12" beyond each side of the fireplace opening is required to protect combustible floor construction in front of the fire- place. Fabricate a hearth extension using a material which meets the following specifications: a layer of noncombustible, inorganic material having a thermal conductivity 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:

0.25 x 1.0" = 0.30" thickness required

0.84

Mantels

A mantel may be installed if desired (see Figure 4). Woodwork such as wood trims, mantels or any oth- er combustible material projecting from the front face must not be placed within 12" (GM36) or 18" (GM42/50) of the fireplace opening. Combustible materials above 12" (GM36) or 18" (GM42/50) and projecting more than 1 1/2" from the fireplace must not be placed less than 15" (GM36) or 21" (GM42/50) 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 the side edge of the black metal face of the fireplace just as long as the projection from the front face fall within the limit shown in Figure 4.

Thermal conductivity "K" of materials can be obtained from the manufacturer or supplier of the noncombustible material. If the hearth extension is to be covered, use noncombustible material such as tile, slate, brick, concrete, metal, glass, marble, stone, etc. Provide a means to prevent the hearth extension from shifting and seal gap between the fireplace frame and hearth extension with a non- combustible material (see Figure 3).

WARNING: Hearth extension

is to be installed only as shown

in Figure 3.

Seal Gap

Fireplace Front

Ember Protector

12 1/4" Ref.

6"

 

Ref.

33°

 

3" Nom.

15" Min.

(GM36) 11/2" Max. 21" Min.

(GM42/50)

12" Min. (GM36)

18" Min. (GM42/50)

Fireplace

Opening

Combustible

Material

Safe

Zone for

Projection of

Combustible

Materials

Upper

Section of

Fireplace

Fireplace Front

 

Raised Hearth

 

Ember Protector

Hearth

 

 

Extension

Fireplace Front

Seal Gap

Elevated

 

Ember Protector

Figure 3 - Hearth Extension

Top View of Fireplace

7.75" (GM36)

FIREBOX

11.5" (GM42/50)

 

 

3" Max.

SAFE ZONE

4.5"

33°

 

Min. to

Combustible

Perpendicular

Material Must

Side Wall

Not Overlap

12" - GM36

Front Face

18" - GM42/50

 

Figure 4 - Mantel Clearances to

Combustible Material

112435-01M

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Desa (V)gM42h, (V)gM50h, (V)gM36h installation manual Hearth Extension, Mantels
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(V)gM36, (V)gM36h, (V)gM42h, (V)gM42, (V)gM50h specifications

Desa (V)gM36h, (V)gM42h, (V)gM42, (V)gM50h, and (V)gM50 are advanced models of the Desa family, showcasing a blend of innovative technologies and robust characteristics designed for versatile functionality in various environments. These models gain recognition for their performance in both residential and commercial applications, each tailored to meet specific user needs.

The (V)gM36h model stands out with its compact design yet powerful capability. It features high energy efficiency, which contributes to lower operational costs while maintaining exceptional performance. The model operates with an advanced control system allowing precise temperature adjustment, ensuring user comfort and energy optimization.

Meanwhile, the (V)gM42h enhances the features of the 36h model with added functionality. Its integration of smart technology allows remote management through mobile applications, facilitating ease of use. The (V)gM42h comes equipped with a self-diagnosis feature that monitors system performance in real-time, alerting the user to potential issues before they become significant problems.

The (V)gM42 is designed with sustainability in mind. It utilizes eco-friendly refrigerants that comply with environmental regulations while delivering optimal cooling and heating performance. This model is also noted for its noise reduction technology, making it an ideal choice for residential spaces where tranquility is paramount.

On the higher end, the (V)gM50h model combines enhanced capacity with advanced features that cater to larger spaces. It integrates variable-speed technology, allowing the system to adjust its output dynamically, which enhances energy efficiency and comfort. The (V)gM50h also includes a robust filtration system that improves indoor air quality by minimizing pollutants.

Finally, the (V)gM50 serves as a flagship offering, combining all the notable advantages of its predecessors with even greater performance efficiency and user-friendly features. It is engineered for heavy-duty performance, making it suitable for demanding commercial applications while still maintaining a user-centric approach for ease of operation.

Collectively, the Desa models represent a significant advancement in temperature control technology, combining energy efficiency, user-friendly features, and environmental considerations to meet the modern demands of users across various sectors.
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