16
INSTALLATION PLANNING
Hussong Mfg. Co., Inc. • Kozy Heat Fireplaces
#ABY R.2 October 2020
3.8 Hearth Extension
WARNING: Hearth extensions MUST be installed exactly as specified.
CAUTION: The lower grill must be allowed to be removed completely.
Do not position fireplace in such a manner that would obstruct this
grill.
IMPORTANT: Metal sealing strip (included) MUST be installed to provide
protection against sparks or embers that might come in contact with
combustible flooring or support.
•
Install the sealing strip so it is centered under the fireplace and
the hearth extension, for the full width of the fireplace. Ensure
that the gap between the hearth and an on-site constructed
hearth extension is sealed, with sand-cement grout and/or
covered with a metal sealing strip.
•
RAISED AND NON-RAISED HEARTHS: Combustible flooring
1
6” (406mm) in front of the fireplace opening and 8” (203mm)
beyond each side of the fireplace opening. The minimum
hearth extension must be insulated with non-combustible floor
protection with a minimum insulation R-value of 0.8.
•
Manufactured hearth materials have a published
R value
(resistance to heat)
or k
value (conductivity of heat)
. Use the
following formula to convert a k value to a R value.
R=1/k x inches of thickness
. See section 3.9 Alternate Floor
Protection Material on page 17 for complete formula.
•
If installing optional heat duct kit HTK-INT, please refer to
instructions included with the kit. Venting for the heat duct kit
should be completed before framing the fireplace.
•
If installing optional #600-1 fan kit, run electrical wiring prior
to enclosing the sides of the fireplace. See Section section 5.0
Optional Fan Installation on page 14.
Metal sealing strips
Non-combustible
hearth extension
material
Sand-cement grout
Floor
Figure 3.7, Hearth Extension
