Exception F200 Wood Insert

Appendix A

Determining Thickness Requirements ofAlternate Hearth Extension Materials.

If a manufacturer’s specifications call for a materialhaving a minimum thickness of one inch with a certain k value, any material substituted for that specified materialmust have the same thickness and have the same or lower kvalue, or if the k value of the selected alternate material is higher, a greater thickness of that material must be used. In some cases, if the k value is lower, thinner materials may be used.

The followingformula gives the meansof determiningthickness of alternate materials:

k of the alternate material

x thickness of

= thickness of

k of the specified material

specified material

alternate material

Example 1: The manufacturer specified a certain material aminimum of one inchthick that is appropriate for use as a hearth extension with their fireplace system. The k value for that material is .84. You decide to use common brick for hearth extension protection instead of that specified material. How thick must the common brickhearth extension be to be equivalent with that which the manufacturer specifies? (Common brick has a K value of 5.)

Using the given formula to determine the equivalent thickness of common brick for the hearth extension, you will divide 5 by .84, which gives a thickness of 5.95 inches of common brick. This means that it would take about six inches of brick to provide the same thermalprotection as one inch of the specified material.

NOTE: Most of the hearth extension protection materials specified by manufacturer’s instructions

are much better insulators than common masonry materials. In this case, brick thickness must be about 6 times greater than the manufacturer’s recommended material.

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Harman Stove Company R7R1 Exception Wood Fireplace manual Appendix a
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R7R1 Exception Wood Fireplace specifications

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One of the standout features of the R7R1 Exception is its impressive heating capacity. This wood fireplace is designed to warm spaces of up to 2,400 square feet, making it ideal for larger homes or open-concept living areas. With a maximum output of 80,000 BTUs, this powerhouse ensures that you will stay cozy even during the coldest winter nights.

In terms of efficiency, the R7R1 Exception boasts an EPA-certified efficiency rating of up to 78%, meaning that it burns exceptionally cleanly while maximizing heat output. This not only reduces your carbon footprint but also lowers the frequency of wood refills, allowing for longer burn times between loads. The intelligent design incorporates advanced combustion technology, which ensures a more complete burn of the wood, leading to reduced emissions and less creosote buildup in the chimney.

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Finally, the R7R1 Exception is constructed with high-quality materials and craftsmanship, ensuring durability and longevity. The robust firebox is lined with firebrick, which enhances thermal mass and efficiency, while the solid steel body offers both strength and modern appeal.

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