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12
Where the flooring material at the opening of the fireplace is
combustible, it is required that the hearth extension be non-
combustible material and be supported by non-combustible
material of a minimum of at least 4 inches thick. This can
include an inch of marble or tile finish material. it is required
that the hearth extension be non-combustible material and be
supported by non-combustible material of a minimum of at least
4 inches thick. This can include an inch of marble or tile finish
material.
The extension should be set flush against the front of the
fireplace front and measure 20” minimum at the front (1’-8” min)
and 12” minimum (1’-0” min) beyond the sides of the fireplace
opening as shown in Figures 10 and 12.
If a raised hearth extension is being installed, it must be
constructed of non-combustible material and any material
under the structure must also be non-combustible.
If using a raised hearth or metal base plate, note that a
combustible wood header must be no closer than 2” to the top
of the dome (see Figure 13).
Attention: You will note that there will be a gap between the
fireplace front and the extension of the non-combustible hearth
material. Be certain that you seal this with non-combustible
material.
1’-8
”
MI
N
2” MIN
2” MIN
8”
MIN
1’-0”
MIN
8”
MIN
1’-0”
MIN
NON-COMBUSTIBLE
FACING MATERIAL
HEARTH EXTENSION *
NON-COMBUSTIBLE
* Not provided as part of fireplace
or sold by Burntech®.
“A”
* MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS.
** MEASURED FROM FLOOR TO TOP OF FIREBRICK LINER.
18” MIN*
MAINTAIN THE 2” CLEARANCE
TO COMBUSTIBLES ABOVE
THE DOME. DO NOT ATTACH
COMBUSTIBLE MATERIALS
ON TOP OF THE DOME.
Figure 13
“H”**
8” MIN*
Condition Dim. “H”**
with 6” platform 10”
with 8” platform 12”
without platform 3”
NON-COMBUSTIBLE
FACING (NOT SUPPLIED).
Fireplace Framing Dimensions
Figure 12
Cross-sectional Top View
(Corner Install):
Combustible Floor Systems
Model A
TFS/OFS-33 70-1/2”
TFS/OFS-39 82-1/2”
TFS/OFS-44 84-1/4”
TFS/OFS-49
86”
TFS/OFS-63 91”
It is required that the hearth
extension be non-combustible
material and be supported by non-
combustible material of a minimum
of at least 4 inches thick.