8
105070
FIREPLACE MANUFACTURERS INCORPORATED
UNVENTED NATURAL GAS LOG HEATER
Noncombustible
Requirements for
Material Distance (A)
Safe Installation
12" or more
Noncombustible material OK.
Between 8" and 12"
24" and 30" Models: Install fireplace hood accessory
(HDABK or HDABR, see
Accessories, page 22).
18" Model: Noncombustible material OK.
Less than 8"
Noncombustible material must be extended to at
least 8". See
Between 8" and 12", above. If you
cannot extend material, you must operate heater
with flue damper open.
Heat Resistant
Material
(A)
Figure 5 - Heat Resistant Material (Slate, Marble, Tile, etc.) Above Fireplace
INSTALLATION
Continued
Minimum NonCombustible
Material Clearances
If Not Using Mantel
Note:
If using a mantel, proceed to If Using
Mantel. If not using a mantel, follow the
information on this page.
You must have noncombustible material(s)
above the fireplace opening. Noncombus-
tible materials (such as slate, marble, tile,
etc.) must be at least 1/2 inch thick. With
sheet metal, you must have noncombustible
material behind it. Noncombustible mate-
rial must extend at least 8" up (for all mod-
els). If noncombustible material is less than
12", you must install the fireplace hood
accessory (24" models only). See Figure 5
for minimum clearances.
IMPORTANT:
If you cannot meet these
minimum clearances, you must operate
heater with chimney flue damper open. Go
to Installing Damper Clamp Accessory for
Vented Operation, page 10.
NOTICE: Manual control heaters
may be used as a vented product.
If so, you must always run heater
with chimney flue damper open.
If running heater with damper
open, noncombustible material
above fireplace opening is not
needed. Go to
Installing Damper
Clamp Accessory for Vented
Operation, page 10.
If Using Mantel
You must have noncombustible material(s)
above the fireplace opening. Noncombus-
tible materials (such as slate, marble, tile,
etc.) must be at least 1/2 inch thick. With
sheet metal, you must have noncombustible
material behind it. Noncombustible mate-
rial must extend at least 8 inches up (for all
models). If noncombustible material is less
than 12", you must install the fireplace hood
accessory (24" models only). Even if non-
combustible material is more than 12", you
may need the hood accessory to deflect heat
away from your mantel shelf. See Figure 5
and Figures 6 and 7, page 9, for minimum
clearances.
IMPORTANT:
If you cannot meet these
minimum clearances, you must operate
heater with chimney flue damper open. Go
to Installing Damper Clamp Accessory for
Vented Operation, page 10.
