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3
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,
a Z-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).
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).
WARNING:
HEARTH EXTENSION IS TO BE
INSTALLED ONLY AS ILLUSTRATED.
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
Figure 2 CORNER INSTALLATIONS
Figure 4
Figure 1 FRAMING DIMENSION
STANDARD HEARTH
STANDARD HEARTH
MODELS 36WS AND 36WIS
MODELS 36WL AND 36WIL
Figure 3 HEARTH EXTENSIONS
