Monessen Hearth DLY18 Installation And Operating Instructions Manual page 11

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 4, then refer to
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 chim-
ney flue damper open. Refer to "Installing Vented Applications" found on page 14.
Heat resistant
material
Heat Resistant
Material
Measurement
16" or more
8" to less than 16"
Less than 8"
TABLE A: Heat Resistant Material Requirements with no Mantel or Combustible Projection
CLEARANCES / HEIGHT REQUIREMENTS
Figure 4: Measuring Heat Resistant Material
Requirements for Safe Installation
DLY18 / GLY18
Hood not required.
Hood not required.
Extend heat
resistant material
to at least 8"
Measure this
distance
Heater in
Fireplace or
Firebox
DLY / GLY 24 & 30
Hood not required.
Extend heat resistent material
to 16" or install hood. See
Figure 5
Extend heat resistant material
to at least 8" and install hood.
See Figure 5. Or, extend heat
resistant material to a height of
at least 16".
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