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25Heat & Glo • GEM36 • 370-900 Rev. O • 2/05
Step 10. Finishing
Figure 28 shows the minimum vertical and corresponding
maximum horizontal dimensions of fireplace mantels or other
combustible projections above the top front edge of the
fireplace. See Figures 2 and 3 for other fireplace clearances.
Only non-combustible materials may be used to cover the
black fireplace front.
WARNING: WHEN FINISHING THE FIREPLACE,
NEVER OBSTRUCT OR MODIFY THE AIR IN-
LET/OUTLET GRILLES IN ANY MANNER.
!
Figure 28.
Minimum Vertical and Maximum Horizontal
Dimensions of Combustibles above Fireplace
CAUTION: IF JOINTS BETWEEN THE FINISHED WALLS
AND THE FIREPLACE SURROUND (TOP AND SIDES)
ARE SEALED, A 300°
F. MINIMUM SEALANT MATE-
RIAL MUST BE USED. THESE JOINTS ARE NOT RE-
QUIRED TO BE SEALED. ONLY NON-COMBUSTIBLE
MATERIAL (USING 300° F. MINIMUM ADHESIVE, IF
NEEDED) CAN BE APPLIED AS FACING TO THE FIRE-
PLACE SURROUND. SEE THE DIAGRAM BELOW.
Figure 29. Sealant Material
Figure 27. Fan Wiring Diagram
HIGH TEMPERATURE (300
0
F / 149
0
C MIN.)
TOP & SIDES SEAL JOINT
!
WARNING: A 8” minimum hearth extension
is required to protect combustible floor con-
struction in front of the fireplace. This hearth must
be constructed of non-combustible material and
extend the width of the fireplace.
FAN
SPEED CONTROL
(RHEOSTAT)
TEMPERATURE
SENSOR SWITCH
JUNCTION BOX
Î
Í
CEILING
COMBUSTIBLE
SHEATHING
1 IN. TYPICAL
31 IN MINIMUM
CLEARANCE
FIREPLACE
HEADER
TOP FRONT
EDGE OF FIREPLACE
NON-COMBUSTIBLE
SHEATHING
TOP OF ARCH
OPENING
13 IN. MINIMUM FROM TOP
OF ARCH OPENING TO
FIRST MANTEL PROJECTION
13 IN. MINIMUM NON-COMBUSTIBLE
SHEATHING ABOVE FIREPLACE
ARCH OPENING
1”
2”
3”
4”
5”
6”
7”
8”
10”
9”
11”
12”
FINISH WALL MATERIAL
MUST BE NON-COMBUSTIBLE
- TOP AND SIDES
41-1/2”
42”
NON-COMBUSTIBLE