CLEARANCES and HEIGHT REQUIREMENTS
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.
Heat |
Resistant |
Material |
Measure |
this |
distance |
Heater in |
Fireplace or |
Firebox |
Figure 5 - Measuring Heat Resistant Material
HEAT RESISTANT | REQUIREMENTS FOR SAFE INSTALLATION | |
MATERIAL |
|
|
NB18 | NB24 | |
MEASUREMENT |
|
|
12" or more | Hood not required. | Hood not required. |
8" to less than 12" | Hood not required. | Extend heat resistant material |
|
| to 12" OR install hood. See |
|
| Figure 5. |
Less than 8" | Extend heat resistant material | Extend heat resistant material |
| and 8” AND install hood. See | to 8" AND install hood. See |
| Figure 5. | Figure 5. OR, extend heat |
|
| resistant material to a height of |
|
| at least 12". |
TABLE A - Heat Resistant Material Requirements with no Mantel or Combustible Projection
12 | 81D0107 |
