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Hearth and Home Technologies ST42A owner manual Finishing, Hearth Extension

Models: ST42A

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8Finishing

A. Hearth Extension

A hearth extension must be installed with all fi replaces to protect the combustible fl oor in front of the fi replace from both radiant heat and sparks. See Figures 8.1-8.3.

 

High temperature

 

 

 

 

 

(300°F min.) continuous,

 

 

 

HX3 or HX4

non-combustible sealant

Fireplace

 

 

non-combustible material

Protective

 

insulation

 

Hearth Ext

Tile, stone or other

 

 

 

or equivilent

 

 

 

 

 

 

 

 

(see Table below)

 

 

Metal Hearth

 

 

 

 

 

Strip

 

 

 

2 in. (51 mm)

 

 

 

Floor constructed of wood or

required

 

 

1 in. (25 mm) overlap

other combustible material

 

 

 

Figure 8.1 Hearth Extension Construction

 

 

 

 

 

 

 

 

Metal strips are placed 2 in. (51 mm) under the

 

 

 

 

 

front of the fireplace and must extend beyond the

 

WARNING

 

 

front and sides of fireplace by 2 in. (51 mm).

 

 

 

Figure 8.2 Positioning the Protective Metal Hearth Strips

 

Fire Risk

 

 

 

 

 

• Metal hearth strips MUST be installed.

WARNING

 

Sparks or embers may ignite fl ooring.

This fi replace has been tested and approved for use with a

Fire Risk

• Hearth extensions must be installed

hearth extension insulated to a minimum R value of 1.16.

exactly as specifi ed.

To substitute materials for the factory-available hearth ex-

High temperatures or hot embers may ignite

tensions, see Figure 8.3 and calculate insulation alternatives

concealed combustibles.

as per Table 8.1 and the following formulas:

 

 

 

•Thermal conductivity per inch thickness = k

•k = (BTU)(inch) / (foot2)(hour)(°F)

•Required thickness = Rk

•Thermal resistance per inch thickness = r

•r = (foot2)(hour)(°F) / (BTU)(inch)

•Required thickness = R / rB.

Table 8.1

 

 

 

 

 

A

 

 

B

 

 

 

 

 

 

 

C

Hearth Extension Insulation Alternatives, R Value = 1.16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Minimum

 

 

 

 

 

 

 

 

 

k per inch

r per inch

thickness

 

 

 

 

 

 

 

 

 

 

 

Model #

A

B

C

 

Material

thick

thick

required

 

 

 

Hearth & Home HX3, HX4

0.43

2.33

1/2 in.

 

 

HX4

in.

66

20

12

 

 

 

 

 

 

 

 

 

 

 

 

USG Micore 300™

0.46

2.18

1/2 in.

 

mm

1676

508

305

 

 

 

 

 

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.

 

Figure 8.3 Hearth Extension Dimensions

 

 

 

 

 

Ceramic Tile

12.50

0.08

14-5/8 in.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Armstrong™ Privacy Guard Plus

.046

2.18

1/2 in.

 

 

 

 

 

 

 

 

Marble

14.3-20.0

0.07-0.05

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

 

 

 

 

 

 

 

 

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Heatilator • ST42A • 35038 Rev G • 02/05

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Hearth and Home Technologies ST42A owner manual Finishing, Hearth Extension Insulation Alternatives, R Value =
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ST42A specifications

Hearth and Home Technologies ST42A is a highly regarded product in the realm of home heating, known for its excellent combination of functionality, efficiency, and aesthetic appeal. This stylish gas fireplace offers the perfect blend of modern design and superior technology, making it an ideal choice for homeowners seeking both comfort and elegance.

One of the main features of the ST42A is its remarkable heating capacity. With a BTU output ranging from 26,000 to 36,000, it efficiently warms spaces, making it suitable for medium to large living areas. This gas fireplace is designed to deliver heat effectively while maximizing energy efficiency, allowing users to enjoy warmth without incurring excessive energy costs.

The ST42A comes equipped with an advanced electronic ignition system, ensuring reliable startup and operation. This system not only adds convenience but also enhances safety, as it minimizes the risk of gas leaks. The fireplace is designed to operate on natural gas or propane, offering flexibility to homeowners based on their fuel availability and preferences.

In terms of design, the ST42A boasts a contemporary look that fits seamlessly into a variety of interior styles. Its large viewing area, framed by a stylish surround, allows for an impressive flame presentation that serves as a focal point in any room. The variable flame height adjustment feature allows users to customize the ambiance and comfort level, further enhancing the overall experience.

One of the standout technologies in the ST42A is its unique heat distribution system. This feature ensures that warmth is circulated throughout the room, rather than being concentrated in one area, promoting an even temperature distribution. Additionally, the fireplace is equipped with optional blower kits that can enhance air circulation, further improving the efficiency of heat delivery.

Maintenance is another significant consideration with any heating appliance, and the ST42A simplifies this with accessible components and easy cleaning features. The ceramic glass front is designed to resist soot buildup, ensuring a clear view of the flames and reducing the need for frequent upkeep.

Overall, the Hearth and Home Technologies ST42A stands out as a premium choice for those looking to add warmth and style to their home. With its powerful heating capabilities, advanced technologies, and elegant design, it represents an investment in both comfort and aesthetic enhancement for any living space.