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Non-Combustible
Material
1 1/2”
MIN
1 1/2” MI
N
1 1/2”
MIN
Hearth Extension
33
” mi
n
12”
min
12”
min
Insulation Behind sheathing
with 1 1/2” Clearance
When Supported
3” min When
Unsupported
1 1/2”
min
1 1/2”
NOT PERMITTED
9”
MIN
Do Not Place Sheathing
WIthin the 1 1/2” Required
Clearance to Combustibles
28
Clearance to Insulation & Vapor Barriers
The Magnum 86072 Series firebox backwall, side walls and the smoke dome back require 1 1/2” clearance. (Figure 66)
Keep all insulation, vapor barriers, “house wrap” paper and other insulating type membranes and products, including
fiberglass, cellulose and other insulation, (anything that carries an “R” rating) a minimum of three inches (3”) away from
all firebox and chimney surfaces.
Exception:
If insulation is used in walls surrounding the fireplace, insulation may be installed behind sheathing of gypsom board,
plywood, particle board or other material on the side facing the Isokern. The facing material cannot be within 1 1/2” to the fireplace
sidewalls.
If insulation or vapor barriers are used in walls surrounding the Magnum 86072 Series fireplace, it is strongly recommended that the
walls be sheathed with gypsum board, plywood, particle board or other material on the side facing the Isokern. Unsecured insulation
and vapor barriers must be placed a minimum of 3” away from the unit.
FIGURE 66
FIGURE 67
Summary of Contents for Magnum 86072-60
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Page 40: ...40 DM Chimney System Lateral Support cont FIGURE 81 FIGURE 82 ...
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