Installation guide

12
Where the ooring material at the opening of the replace 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 nish 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 nish
material.
The extension should be set ush against the front of the
replace front and measure 20” minimum at the front (1’-8” min)
and 12” minimum (1’-0” min) beyond the sides of the replace
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
replace front and the extension of the non-combustible hearth
material. Be certain that you seal this with non-combustible
material.
1’-8”
MIN
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 replace
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.