Desa 36WIS, 36WIL Framing Dimension, Corner Installations Hearth Extension, Hearth Extensions

STEP 5: Before securing fireplace to prepared framing, the ember protector (provided), must be placed between the hearth extension (not supplied), and under the bottom front edge of the fireplace to protect against glowing embers falling through. If the fireplace is to be installed on a raised platform,

aZ-type ember protector (not supplied) must be fabricated to fit your required platform height. The ember protector should extend under the fireplace a minimum of 1-½”. The ember protector should be made of galvanized sheet metal (28ga. minimum) to prevent corrosion.

STEP 6: Using screws or nails, secure the fireplace to the framing through flanges located on the sides of the fireplace (see figure 4).

Figure 1 FRAMING DIMENSION

Figure 2 CORNER INSTALLATIONS

HEARTH EXTENSION:

A hearth extension projecting a minimum of 16” in front of and a minimum of 8” beyond each side of the fireplace opening is required to protect combustible floor construction in front of the fireplace. Fabricate a hearth extension using a material which meets the following specifications: a layer of non-combustible, 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. 0.25/0.84 x 1.0” = 0.30 thickness required. Thermal conductivity “K” of materials can be obtained from the manufacturer or supplier of the non-combustible material.] If the hearth extension is to be covered, use non-combustible material such as tile, slate, brick, concrete, metal, glass, marble, stone etc. Provide a means to prevent the hearth

extension from shifting and seal the gap between the fireplace frame and hearth extension with a non-combustible material (see figure 3).

MODELS36WSAND 36WIS	MODELS36WL AND 36WIL
STANDARD HEARTH	STANDARD HEARTH

Figure 3 HEARTH EXTENSIONS

WARNING: HEARTH EXTENSION IS TO BE INSTALLED ONLY AS ILLUSTRATED.

Figure 4

OPTIONAL OUTSIDE AIR KIT (MODEL AK4 / AK4F) The installation of an outside air kit should be installed during the rough framing of the fireplace due to the nature of its location. Outside combustion air can be accessed through a vented crawl space (AK4F) or through a sidewall (AK4). See accessories on page 10 for details.

Figure 5

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