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D. Mantel, Wall Projections, & Hearth
Extensions
WARNING! Risk of Fire! Comply with all minimum clear-
ances to combustibles as specified. Framing or finishing
material closer than the minimums listed must be construct-
ed entirely of noncombustible materials (i.e., steel studs,
concrete board, etc).
Clearance to combustible material under the insert is 1/4
inch (6 mm).
• Use leveling legs to raise insert minimum 1/4 inch (6
mm) above combustible material or outer wrap of factory
built firebox.
Combustible facings must not extend behind the insert
surround. For non-combustible material specifications
refer to Section 1.E and 1.F.
Mantel Legs or Wall Projections
TOP VIEW
SURROUND OPENING
*
A
*SEE TABLE
1 or 2
C L
SURROUND OPENING
Figure 3.15 Clearances to Mantel Legs or Wall Projections
(Acceptable on both sides of surround opening)
Majestic • TRILLIANT25IN, TRILLIANT30IN, TRILLIANT35IN Installation Manual • 2571-980 Rev. B • 5/23
18
Combustible
1/4 in. GAP
INTERIOR WALL
2 in.
4 in.
6 in.
12 in.
18 in.
MANTEL LEG OR WALL PROJECTIONS
Non-Combustible
TOP VIEW
INTERIOR WALL
1/4 in. Gap
2 in.
4 in.
6 in.
12 in.
18 in.
MANTEL LEG OR
WALL PROJECTIONS
Mantels or Wall Projections - Non-Combustible
Note: Measurement is taken from top of the surround
opening.
Figure 3.16 Minimum Vertical and Maximum Horizontal
Unit Size
25 in.
∞
30 in.
35 in.
Table 1 Mantel Leg or Wall Projection Minimum Dimension
needed when Installing a Standard Surround
Unit
Size
25 in.
30 in.
∞
35 in.
Table 2 Mantel Leg or Wall Projection Minimum Dimension
needed when Installing a Custom Surround. Front Model
Determines the Minimum Size of the Custom Surround
Note: All numbers in Tables 1 and 2 include the 1/4 in. gap on
surround edge.
12 in.
1/4 in. gap
6 in.
*B
SURROUND
OPENING
*SEE TABLE
Dimensions- Non-Combustible
Surround
Model
MI25-3523
17-15/16 in.
MI25-3726
18-15/16 in.
MI25-3928
19-15/16 in.
MI30-4027
20-7/16 in.
MI30-4230
21-7/16 in.
MI30-4432
22-7/16 in.
MI35-4229
21-7/16 in.
MI35-4432
22-7/16 in.
MI35-4832
24-7/16 in.
Front Model
INFIT
FA-TRI, TA-TRI,
MFV-TRI, CSFI25
INFIT
16-13/16 in. 1-1/4 in.
FA-TRI, TA-TRI,
MFV-TRI, CSFI30
INFIT
FA-TRI, TA-TRI,
MFV-TRI, CSFI35
12 in.
1 or 2
A
B
6-1/16 in.
9-1/16 in.
11-1/16 in.
6-9/16 in.
9-9/16 in.
11-9/16 in.
5-1/16 in.
8-1/16 in.
8-1/16 in.
A
B
14-5/16 in.
1-1/4 in.
16-1/16 in.
2-1/2 in
18-9/16 in.
2-1/2 in
19-5/16 in.
1-1/4 in.
21-1/16 in.
2-1/2 in
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