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Clearances to Combustible Side Walls
The minimum distance required from the
side edge of the glass frame to a
combustible side wall is 12" (10" from the
side edge of this appliance). Combustible
side walls, mantel corbels, mantel legs and
other combustible walls and decorative
objects must fall behind a 45-degree line
extending outward from the side edges of
the visible glass unless such objects are
more than 12" away from the side edges of
the glass frame. See
Figure 3-25 Side Wall
Clearances.
A wall, perpendicular and in front of this
appliance's glass door face must be at least 12" away from the side edges of the glass frame.
A wall at a 45
o
angle to the front face and starting at the Side Edge of the Front Face of this appliance is allowed. Projections
behind this 45
angle edge (shaded area) are allowed.
o
If the required clearance cannot be met to a pre-existing combustible side wall, an NFPA approved clearance
reduction shield, metal or ceramic board, must be added to the side wall.
Horizontal Clearance
3.2.4.3.1
NPFA 211 Approved: Install 20-gauge or heavier steel shield that provides at least a 1" active airspace, on the combustible wall
surface. To provide for active airflow, install at least 1" metal or ceramic standoffs or spacers between the metal shield and the
combustible surface being protected. The bottom and top edges of the cavity between the metal shield and the combustible
surface must be left open. The steel shield must be a minimum of 12" larger in each direction than the surface area of the
source of heat; or if the surface being protected is smaller than surface area of the source of heat, this shield must be larger
than the combustible surface in each direction.
By using this method of protection, if the required horizontal clearance was 12", the resulting clearance will be reduced by 66%
to 4" between the heat source and the metal shield.
3.2.4.3.2 Horizontal Clearance Reduction by 50%
NPFA 211 Approved: Install an R-1 rated ceramic board or R-1 rated mineral board on the wall you are attempting to protect.
by using this method of protection, if the required horizontal clearance was 12", the resulting clearance will be reduced by 50%
to 6" between the heat source and the R-1 Rated wall board.
85-03-01116
Reduction by 66%
DXV42 TIMBERFIRE
Figure 3-24 Side Wall Clearances
Page 25
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