Monessen Hearth MJ27NR - Manual (Page 12)

12 86D0024
FP1997
heat resistant material
Heat Resistant
Material
Heater in Fireplace
or Firebox
FP1997
Measure
This
Distance
Figure 5 - Measuring Heat Resistant Material
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, per Figure 5, then see 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 clearances you must operate the heater with chimney flue
damper open. Refer to “Installing Vented Applications” found on Page 18.
TABLE A - Heat Resistant Material Requirements with no Mantel or Combustible Projection
CLEARANCES and HEIGHT REQUIREMENTS
Heat Resistant
Material Requirements for Safe Installation
Measurement MJ27
12" or more Hood not required
8" to less than 12" Extend heat resistant material to 12" OR install hood.
Refer to Figure 5
Less than 8" Extend heat resistant material to 8" AND install hood.
Refer to Figure 5. OR, extend heat resistant material
to a height of at least 12"