14”
8”
12"
26"
4"8"
20"
12”
COMBUSTIBLE
MANTLE SHELF
20” HEARTH
EXTENSION
COMBUSTIBLE
FLOOR SYSTEM
ADJOINING
ROOM WALL
HEARTH
EXTENSION
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
noncombustible 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
subooring 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
combustible 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 clearance 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
To Next Page
Loading...
Need help?
General
