7
18NB/24NB Gas Log Set
81D0108
16"
42"
CLEARANCES
and
HEIGHT REQUIREMENTS
Sidewall and ceiling clearances:
The
sides
of the fire-
place opening must be
at least 16"
from any combustible
wall. The
ceiling
must be
at least 42"
from the top of the
fireplace opening.
Figure 3 -
Sidewall and Ceiling Clearances
W
ARNING
The dimensions shown in
Figures 3 through 11
and defined in the
fireplace manufacturer's instructions are minimum clearances to
maintain when installing this heater. Left and right clearances are
determined when facing the front of the heater.
When heater is installed into a ventless firebox, minimum clearances,
as specified by the ventless firebox manufacturer, must be met.
Follow these instructions carefully to ensure safe installation. Failure
to follow instructions exactly can create a fire hazard.
Heat resistant material (minimum requirements) with
no wooden mantel or other combustible projection:
To install the gas logs into a fireplace with no wooden
mantel, shelf or other combustible projection above the
fireplace opening, measure the heat resistant material
height,
according to Figure 4 and
TABLE A
.
Heat resistant materials such as slate and marble must
be
at least 1/2” thick. Sheet metal should not be installed
onto combustible material.
IMPORTANT:
If you cannot meet these minimum clear-
ances you must operate the heater with chimney flue
damper open. Refer to “Installing Vented Applications”
found on Page 17.
FP2254
measure heat resist
Heat resistant
Material
Measure
This
Distance
Heater in
Fireplace/
Firebox
FP2254
Figure 4 -
Measure Heat Resistant Material
Table A - Heat Resistant Material Requirements with No Mantel or Combustible Projection
Heat Resistant
Requirements for Safe Installation
Material Measurement
18NB
24NB
12” or more
Hood not required
Hood not required
8” or less than 12”
Hood not required
Extend heat resistant material to 12” or install hood. Figure 4
Less than 8”
Extend heat resistant
Extend heat resistant material to 8” AND install hood.
material to 8” AND
Figure 5. OR, extend heat resistant material to a height of
install hood. Figure 4
at least 12”
