Comfort Glow CGD3924N Owner's Operation And Installation Manual page 11

INSTALLING
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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 acces-
sory (24" and 30" models 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 Acces-
sory for Vented Operation, page 13.
Non-Combustible
Material Distance (A)
12" or more
Between 8" and 12"
Less than 8"
Mantel Clearances
In addition to meeting non-combustible 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 Clearance
If you meet minimum clearance between mantel shelf and top of fireplace open-
ing, a hood is not required (see Figure 6).
Minimum Non-
Combustible
Material
Figure 6 - Minimum Mantel Clearances Without Using Hood
Requirements for
Safe Installation
Non-combustible material okay.
24" or 30" Models: Install fireplace hood acessory
(GA6050 or GA6052, see Accessories, page 33).
18" Model: Non-combustible material okay.
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.
Mantel Shelf
10"
8"
6"
1
2 "
/2
(A)
1 /2 1 /2
12" 20" 24 " 27
3 /4 1 /2
8" 14" 16 " 18
Minimum Non- Distances to
Combustible Underside of
Material Height Mantel
Underside of
Mantel Shelf
All minimum
distances are
in inches
Log Set
" 30" 24"/30" Models
" 20"
18" Model
Top of Fireplace
Opening
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