Installation
Continued
If Using Mantel
You must have noncombustible material(s) above the fireplace opening. Noncombustible materials (such as slate, marble, tile, etc.) must be at least 1/2" thick. With sheet metal, you must have non- combustible 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 (24" and 30" models only). Even if noncombustible material is more than 12", you may need the hood acces- sory to deflect heat away from your mantel shelf. See Figure 5 and Figures 6 and 7 on 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 11.
Noncombustible | Requirements for |
Material | Safe Installation |
Distance (A) |
|
|
|
12" or more | Noncombustible material |
| okay. |
Between 8" | Install fireplace hood |
and 12" | accessory (GA6050, |
| GA6052 or GA6053 see |
| Accessories, page 34). |
Less than 8" | Noncombustible material |
| must be extended to at |
Mantel Clearances
In addition to meeting noncombustible material clearances, you must also meet required clearances between fireplace opening and mantel shelf. If you do not meet the clearances listed below, you will need a hood.
Determining Minimum Mantel Clearances If you meet minimum clearance between mantel shelf and top of fireplace opening, a hood is not required (see Figure 6).
Determining Minimum Mantel Clearances
When Using a Hood
If minimum clearances in Figure 6 are not met, you must have a hood. When using a hood there are still certain minimum mantel clearances required. Follow minimum clearances shown in Figure 7, page 11, when using hood.
NOTICE: Surface temperatures ofadjacentwallsandmantelsbe- comehotduringoperation.Walls and mantels above the firebox may become hot to the touch. If installed properly, these tem- peratures meetthe requirements of the national product standard. Follow all minimum clearances shown in this manual.
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)
|
| 10" | |
|
| 8" |
|
|
| 6" |
|
|
| 2 1/2" | |
Minimum |
|
| (A) |
|
| ||
Noncombustible |
| ||
Material |
| 12" | |
|
|
| |
|
|
| 8" |
|
|
|
|
Mantel Shelf
18" |
| 20" | 22" |
| |||
8" |
| 14" | 17" |
|
|
|
|
Underside
of Mantel
Shelf
All minimum distances are in inches
Log Set
24"/30"
24" 
Models
20" 
18" Model
Top of Fireplace Opening
Minimum | Distances to |
Noncombustible | Underside of |
Material Height | Mantel |
Figure 6 - Minimum Mantel Clearances
Without Using Hood
Figure 5 - Heat Resistant Material (Slate,
Marble, Tile, etc.) Above Fireplace
10 | www.desatech.com |
