FIREPLACE MANUFACTURERS INC.
UNVENTED NATURAL GAS LOG HEATER
INSTALLATION
Continued
NOTICE: Manual control heaters may be used as a vented product. If so, you must always run heater with chimney flue damper open. If running heater with damper open, noncombustible material above fireplace opening is not needed. Go to Installing Damper Clamp Accessory for Vented Op- eration, page 10.
Minimum Noncombustible Material Clearances
If Using Mantel
You must have noncombustible material(s) above the fireplace opening. Noncombus- tible materials (such as slate, marble, tile, etc.) must be at least 1/2 inch thick. With sheet metal, you must have noncombustible material behind it. Noncombustible mate- rial must extend at least 8 inches up. If noncombustible material is less than 12", you must install the fireplace hood acces- sory. Even if noncombustible material is more than 12", you may need the hood accessory to deflect heat away from your mantel shelf. See Figure 5, and Figures 6 and 7, page 9, for minimum clearances.
IMPORTANT: If you cannot meet these minimum clearances, you must operate heater with chimney flue damper open. Go to Installing Damper Clamp Accessory for Vented Operation, page 10.
If Not Using Mantel
Note: If using a mantel, see If Using Mantel. If not using a mantel, follow the information below.
You must have noncombustible material(s) above the fireplace opening. Noncombus- tible materials (such as slate, marble, tile, etc.) must be at least 1/2 inch thick. With sheet metal, you must have noncombustible material behind it. Noncombustible material must extend at least 8" up (for all models). If noncombustible material is less than 12", you must install the fireplace hood accessory. See Figure 5 for minimum clearances.
IMPORTANT: If you cannot meet these minimum clearances, you must operate heater with chimney flue damper open. Go to Installing Damper Clamp Accessory for Vented Operation, page 10.
Noncombustible | Requirements for |
Material Distance (A) | Safe Installation |
|
|
12" or more | Noncombustible material OK. |
Between 8" and 12" | 24" or 30" Models: Install fireplace hood accessory |
| (HDABK or HDABR see Accessories, page 24). |
| 18" Model: Noncombustible material OK. |
Less than 8" | Noncombustible material must be extended to at |
| least 8". See Between 8" and 12", above. If you |
| cannot extend material, you must operate heater |
| with flue damper open. |
|
|
Heat Resistant 
Material
(A)
Figure 5 - Heat Resistant Material (Slate, Marble, Tile, etc.) Above Fireplace
8 | 105072 |