12
INSTALLING
Continued
Minimum Non Combustible Material Clearances
If Using Mantel
You must have non combustible material(s) above the fireplace opening. Non combustible materials (such as slate, marble, tile, etc.) must be at least 1/2 inch thick. With sheet metal, you must have non combustible material behind it. Non combustible material must extend at least 8 inches up (for all models). If non combustible material is less than 12", you must install the fireplace hood accessory (24" model only). Even if non combustible material is more than 12", you may need the hood accessory to deflect heat away from your mantel shelf. See chart below and Figures 6 and 7 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 14.
Requirements for | |
Material Distance (A) | Safe Installation |
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12" or more | Non combustible material OK. |
Between 8" and 12" | 24" Model: Install fireplace hood accessory (GA6050 |
| or GA6052, see Accessories, page 34). |
| 18" Model: Non combustible material OK. |
Less than 8" | Non combustible 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. |
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Mantel Clearances
If you meet minimum clearance between mantel shelf and top of fireplace opening, a hood is not required (see Figure 6).
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| 8" |
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| 6" |
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| 2 1/2" |
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Minimum Non- |
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Combustible |
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| 12" | 20" | 241/2" | 271/2" | 30" |
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| 8" | 14" | 163/4" | 181/2" | 20" |
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Top of Fireplace
Opening
Minimum Non- | Distances to |
Combustible | Underside of |
Material Height | Mantel |
Figure 6 - Minimum Mantel Clearances Without Using Hood
If above minimum clearances are not met, you must have a hood. Follow minimum clearances shown in Figure 7 on page 13 when using hood.
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