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 38.1 below, and Figures 40.1 and 40.2 on page 40.

 

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 equivalent

 

 

 

 

 

 

(see Table below)

 

 

 

Metal Hearth

 

 

 

 

Strip

 

 

2 in. (51 mm)

 

Floor constructed of wood or

required

 

 

other combustible material

 

 

 

Figure 38.1 Hearth Extension Construction

WARNING

Fire Risk

•Maintain clearances.

•Use only non-combustible material below standoffs, material such as cement board is acceptable.

•Framing or finishing material used on the front of, or in front of, the appliance closer than the minimums listed, must be constructed entirely of noncombustible materials (i.e., steel studs, concrete board, etc.).

B. Calculating Alternate Floor Protection

Material

Thermal Conductivity: k value

The k value indicates the amount of heat (in BTU’s) that will flow in 1 hour through 1 square foot of a uniform material 1 inch thick for each degree (F) of temperature difference from one side of the material to the other. The LOWER the k factor means less heat is being conducted through the non-combustible material to the combustible material beneath it. The k value of a mate- rial must be equal or smaller then the required k value to be acceptable.

(BTU) (inch) (foot2 (hour) (oF)

Thermal Resistance: R value

The R value is a measure of a material’s resistance to heat transfer. R value is convenient when more than one material is used since you can add the R values together,

whereas you can not do this for k value. The HIGHER the R factor means less heat is being conducted through the non- combustible material to the combustible material beneath it. The R value of a material must be equal or larger then the required R value to be acceptable.

Converting k to R:

Divide 1 by k and multiply the results times the thickness in inch- es of the material.

R = 1/k x inches of thickness

Converting R to k:

Divide the inches of thickness by R.

k = inches of thickness/R

Calculations:

Example: Floor protection requires k value of 0.84 and 3/4 inch thick.

Alternative material has a k value of 0.6 and is 3/4 inch thick.

Divide 0.6 by .75 = k value of 0.80. This k value is smaller than 0.84 and therefore is acceptable.

Table 38.1

Hearth Extension Insulation Alternatives

Minimum R Value = 2.18

 

 

 

Minimum

Material

k per inch

R per inch

thickness

thick

thick

required

Hearth & Home HX3, HX4

0.49

2.18

1 in.

USG Micore 300™

0.49

2.18

1 in.

USG Durock™ Cement Board

1.92

0.52

2-1/4 in.

Cement Mortor

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

2.18

1/2 in.

Marble

14.3-20.0

0.07-0.05

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

Page 38

Heat & Glo • NorthStar EPA Fireplace • 480-1081C

September 1, 2008

Page 37 Page 39
Page 38
Image 38
Hearth and Home Technologies NorthStar-BK Finishing, Hearth Extension, Calculating Alternate Floor Protection Material
Page 37 Page 39

NorthStar-GT, NorthStar-BK, NorthStar-NT specifications

Hearth and Home Technologies has established itself as a leader in the production of innovative heating appliances, particularly with the launch of its NorthStar series: NorthStar-NT, NorthStar-BK, and NorthStar-GT. These models are designed to deliver superior performance, aesthetic appeal, and advanced technology, making them an excellent choice for modern homes.

The NorthStar-NT model is ideally suited for those seeking a reliable and efficient heating solution. It boasts a powerful, advanced heating technology that maximizes heat output while minimizing fuel consumption. The NorthStar-NT employs a unique combustion system that ensures a cleaner burn, resulting in fewer emissions and a lower environmental impact. The sleek design of the NorthStar-NT allows it to blend seamlessly into any room, making it not just a heating unit but also an attractive focal point.

On the other hand, the NorthStar-BK variant stands out for its versatility and aesthetic flexibility. It offers an array of customizable options, enabling homeowners to match the unit's appearance with their interior decor. The NorthStar-BK features a large viewing area, which enhances the visual appeal of the flames while providing efficient heat distribution. This model incorporates user-friendly controls that allow for easy temperature adjustments, ensuring that comfort is just a button away.

The NorthStar-GT model elevates the heating experience with its advanced smart technology features. Equipped with Wi-Fi connectivity, the NorthStar-GT allows users to control the appliance remotely via a smartphone app. This model also supports voice-activated commands, integrating seamlessly with smart home systems. The NorthStar-GT emphasizes energy efficiency, with programmable settings that enable users to optimize heating schedules to their lifestyle, ultimately contributing to energy savings.

All three NorthStar models feature durable construction and high-quality materials designed to withstand years of use. Their construction ensures not only longevity but also safety, with multiple safety features integrated into each model. Easy maintenance and cleaning options further enhance their user-friendly design.

In summary, the Hearth and Home Technologies NorthStar series including the NorthStar-NT, NorthStar-BK, and NorthStar-GT brings together cutting-edge technology, unparalleled efficiency, and stunning aesthetics. Each model caters to different needs, ensuring that homeowners can find the perfect heating solution that fits their style and requirements.
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