8 Finishing

A. Hearth Extension

A hearth extension must be installed with all fireplaces to protect the combustible floor in front of the fireplace from both radiant heat and sparks. See Figures 8.1-8.3.

WARNING

Fire Risk

• Metal hearth strips MUST be installed.

HX3 or HX4 Hearth Ext or equivilent insulation

(see Table below)

High temperature (300°F min.) continuous, non-combustible sealant

Tile, stone or other non-combustible material

Fireplace

Protective

Metal Hearth

Strip

Sparks or embers may ignite flooring.

2 in. (51 mm)

Floor constructed of wood or required other combustible material

Figure 8.1 Hearth Extension Construction

The hearth extension should slope away from the front of the fireplace and chase at 1/8 in. to 1/4 in. per foot. Spark strips must be used on top of any combustible hearth materials used for moisture management.

This fireplace has been tested and approved for use with a hearth extension insulated to a minimum R value of 1.16.

To substitute materials for the factory-available hearth ex- tensions, see Figure 8.3 and calculate insulation alterna- tives as per Table 8.1 and the following formulas:

•Thermal conductivity per inch thickness = k

•k = (BTU)(inch) / (foot2)(hour)(°F)

•Required thickness = Rk

1 in. (25 mm) overlap

Metal strips are placed 2 in. (51 mm) under the front of the fireplace and must extend beyond the front and sides of fireplace opening by 2 in. (51 mm).

Figure 8.2 Positioning the Protective Metal Hearth Strips

WARNING

Fire Risk

•Hearth extensions must be installed exactly as specified.

High temperatures or hot embers may ignite concealed combustibles.

•Thermal resistance per inch thickness = r

•r = (foot2)(hour)(°F) / (BTU)(inch)

•Required thickness = R / rB.

Table 8.1

Hearth Extension Insulation Alternatives, R Value = 1.16

 

 

 

Minimum

 

k per inch

r per inch

thickness

Material

thick

thick

required

Hearth & Home HX3, HX4

0.43

2.33

1/2 in.

USG Micore 300™

0.46

2.18

1/2 in.

 

 

 

 

USG Durock™ Cement Board

1.92

0.52

2-1/4 in.

Cement Mortar

5.0

0.20

5-7/8 in.

 

 

 

 

Common Brick

5.0

0.20

5-7/8 in.

Ceramic Tile

12.50

0.08

14-5/8 in.

Armstrong™ Privacy Guard Plus

0.46

3.28

1/2 in.

 

 

 

 

Marble

14.3-20.0

0.07-0.05

16-5/8 in. - 23-3/8 in.

 

A

 

C

B

 

 

 

 

 

 

 

 

 

 

 

 

CAT. #

 

A

 

B

HX3

in

52

 

16

 

mm

1321

 

406

 

 

 

 

 

HX4

in

66

 

20

 

mm

1676

 

508

Figure 8.3 Hearth Extension Dimensions

Heat & Glo LifeStyles Collection • Montana • 4039-150 Rev I • 08/06

23

Page 22 Page 24
Page 23
Image 23
Heat & Glo LifeStyle Montana-36, Montana-42 owner manual Finishing, Hearth Extension Insulation Alternatives, R Value =
Page 22 Page 24

Montana-42, Montana-36 specifications

The Heat & Glo LifeStyle Montana-42 and Montana-36 gas fireplaces represent a notable fusion of modern design and advanced technology, catering to homeowners seeking both functionality and aesthetic appeal. These two models are part of the LifeStyle series, crafted to enhance living spaces while offering efficient heating solutions.

One of the most striking features of the Montana series is its contemporary design. Both models boast large viewing areas framed by sleek lines, allowing for an unobstructed view of the beautiful flames. The Montana-42, with its 42-inch width, provides a larger fire display, creating a dramatic focal point in any room. The Montana-36, while slightly smaller, still offers a captivating fire view that can effortlessly enhance a space's ambiance.

In terms of technology, these fireplaces are equipped with Heat & Glo’s innovative IntelliFire™ ignitions system. This advanced ignition technology ensures reliable and safe startup with minimal effort. Homeowners appreciate the convenience of remote control operation, enabling them to adjust flame height and heat output to suit their preferences without leaving their seats.

Efficiency is a cornerstone of the Montana series. Both models are designed to maximize heat output while minimizing fuel consumption. With high-efficiency ratings, they not only provide warmth but also contribute to the overall energy savings in the home. This is particularly beneficial in colder climates where heating can significantly increase energy costs.

Another noteworthy feature of the Montana fireplaces is the customizable aesthetics. Consumers can choose from a range of liner options, media types, and decorative fronts to create a personalized look that fits their unique style. The ability to tailor the fireplace to individual tastes ensures that it becomes a seamless fit within any interior design scheme.

Moreover, the Montana-42 and Montana-36 are designed with ease of installation in mind, offering installation flexibility that accommodates various spaces and building requirements. The sealed combustion system enhances safety by drawing air from outside for combustion, preventing the depletion of indoor air.

In conclusion, the Heat & Glo LifeStyle Montana-42 and Montana-36 gas fireplaces are exemplary choices for homeowners seeking a blend of efficiency, modern design, and customizable features. With advanced technology that promotes ease of use and energy efficiency, these models stand out as significant additions to contemporary living spaces. Whether you opt for the larger Montana-42 or the slightly more compact Montana-36, both fireplaces promise to deliver warmth and aesthetic charm that enhances the comfort of your home.
Top Page Image Contents