11
Where the flooring material at the opening of the fireplace is
combustible, it is required that the hearth extension be covered
with a non-combustible 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 *
*
Not provided as part of fireplace
NON-COMBUSTIBLE
* Not provided as part of fireplace
or sold by MFI.
“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
MFP-33 70-1/2”
MFP-39 82-1/2”
MFP-44 84-1/4”
MFP-49
86”
MFP-63
91”