14"
8”
12"
COMBUSTIBLE
FLOOR SYSTEM
EXTENSION
HEARTH
COMBUSTIBLE
MANTLE SHELF
ADJOINING
ROOM WALL
HEARTH
EXTENSION
20”
26"
4"8"
20"
12”
Non-combustible Finished Facing requirements &
Clearance to Combustible Trim
Hearth Extensions:
All MAGNUM replaces shall have hearth extensions
of brick, concrete, stone, tile or other code approved noncom-
bustible material. Suitable hearth extension material for the
MAGNUM replace shall be placed on the hearth extension’s
noncombustible substrate and must extend to at least twenty
inches (20”) in front of the replace’s nished opening and must
extend to at least twelve inches (12”) beyond the sides of the
nished replace opening. (Figure 83)
WARNING: The noncombustible hearth extension, by code,
must sit on noncombustible substrate which shall have no wood
underpinnings.
This means that off-grade wood oor systems shall be
constructed in such a way that all wood oor joists and sub-
ooring shall stop twenty inches (20”) out from the front of the
MAGNUM rebox. (Figure 82)
Mantle and Mantle Shelf Clearances: Magnum replaces are
subject to the same building code safety clearances to combus-
tible trim as with any radiant heat replace.
All combustible trim shall be kept at least eight inches
(8”) from the nished replace opening. Combustible trim
located along the sides of the replace opening, which project
more than one and one-half inches (1-1/2”) from the face of the
replace, shall have additional clearance from the eight inches
(8”) equal to the projection. Combustible projecting mantles - up
to twelve inches (12”) of projection - shall not be placed less
than fouteen inches (14”) from the top of the replace opening.
Combustible mantles which project more than twelve inches
(12”) from the face of the replace, shall have additional clear-
ance from the fourteen inches (14”) equal to the projection.
Note: The local authority having jurisdiction may require
greater clearances for projection combustible mantle shelves.
Be sure to check local building codes regarding required
clearances to projecting combustible mantles.
Adjoining Walls. Side walls and walls to rooms adjoining
MAGNUM replace installations cannot be closer than
twenty-six inches (26”) to the nished replace opening.
(Figure 83)
Note: “Clearance to Combustible Trim” are those distances
required to ensure that a replace mantle or facing will not
catch re. In most cases the distances should also be adequate to
prevent any discoloration or warping due to heat. However each
installation presents a unique and completely different set of
circumstances involving many variables.
These include paint or nish composition, previous
exposure to heat, methods and quality of construction, air ow
patterns, etc. Because of these variables, the manufacturer does
not guarantee that heat warping or discoloration will never
occur.
39
FIGURE 82
FIGURE 83
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