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 fireplaces shall have hearth
extensions of brick, concrete, stone, tile or other code approved
noncombustible material. Suitable hearth extension material
for the MAGNUM fireplace shall be placed on the hearth
extension’s noncombustible substrate and must extend to at
least twenty inches (20”) in front of the fireplace’s finished
opening and must extend to at least twelve inches (12”) beyond
the sides of the finished fireplace 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 floor systems shall be
constructed in such a way that all wood floor joists and
subflooring shall stop twenty inches (20”) out from the front of
the MAGNUM firebox. (Figure 82)
Mantle and Mantle Shelf Clearances:
Magnum fireplaces
are subject to the same building code safety clearances to
combustible trim as with any radiant heat fireplace.
All combustible trim shall be kept at least eight inches
(8”) from the finished fireplace opening. Combustible trim
located along the sides of the fireplace opening, which project
more than one and one-half inches (1-1/2”) from the face of
the fireplace, 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
fireplace opening. Combustible mantles which project more
than twelve inches (12”) from the face of the fireplace, 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 fireplace installations cannot be closer than twenty-
six inches (26”) to the finished fireplace opening. (Figure 83)
Note:
“Clearance to Combustible Trim” are those distances
required to ensure that a fireplace mantle or facing will not
catch fire. 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 finish composition, previous
exposure to heat, methods and quality of construction, air flow
patterns, etc. Because of these variables, the manufacturer does
not guarantee that heat warping or discoloration will never
occur.
39
FIGURE 82
FIGURE 83
