Monessen Hearth GLX18 User Manual

12

14D2099

Measure 
this
distance

Heater in 
Fireplace or 
Firebox

Heat 
Resistant
Material

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.

 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 17.

12" or more

Hood not required.

Hood not required.

8" to less than 12"

Hood not required.

Extend heat resistent material to 12"
or install hood. 

See Figure 5.

Less than 8"

Extend heat resistant

Extend heat resistant material to at

material to at least 8"

least 8" and install hood. 

See Figure

5. OR, extend heat resistant material
to a height of at least 12".