Martin Fireplaces SB5400SS - Manual (Page 11)

10
F
LOOR
P
ROTECTION
If this fireplace is installed on a combustible floor, the floor area 20 inches in front of, and 12 inches either side
of the fireplace opening must be protected by an insulating noncombustible hearth extension. This hearth
extension may be either minimum 6-inch thick stone or brick as shown by Figure 11, an H2068 hearth exten-
sion kit or a locally constructed equivalent to the H2068.
The H2068 hearth extension kit consists of sufficient insulation board to cover the 20" x 68" floor area with ˚
inch layer of insulation. A 20" x 68" piece of galvanized steel is included in the kit to cover the insulation before
a finishing layer of noncombustible material of stone, brick, tile, etc., is applied to finish the hearth extension.
The insulation used in the H2068 hearth extension has a thermal conductivity (K factor) of 0.43. If you do
construct a hearth extension equivalent to the H2068, be sure the insulation you use has enough compressive
strength to support the weight of the covering materials and persons standing on it, and insulating qualities
equal to or better than the 1/2" covering provided by the H2068.
20"
(MIN)
6"
(MIN)
12"
(MIN)
12"
(MIN.)
BRICK OR STONE HEARTH
EXTENSION - 68" LONG MIN. SAFETY STRIP IS REQUIRED WHEN
UNIT IS PLACED ON A COMBUSTIBLE FLOOR
OR PLATFORM.
HEARTH
SB5400SS
FIREPLACE
ALTERNATE BRICK OR STONE
HEARTH EXTENSIONS FOR USE
WITH THE SB5400SS FIREPLACE
WHEN PLACED OVER A COM-
BUSTIBLE FLOOR WITHOUT
INSULATION BOARD PROTECTION
FIREPLACE AND HEARTH EXTENSION AND TOP VIEW
SB5400SS MINIMUM HEARTH EXTENSION DIMENSIONS
NOTE: A hearth extension placed on a combustible NOTE: A hearth extension placed on a combustible
floor must be constructed with rigid insulation which
floor must be constructed with rigid insulation which
has a minimum "R" value of 1.16 or a "K" value of
0.43. The insulation must be covered with a
non-combustible covering such as a tile stone,
marble, or a piece of 0.018 minimum sheet metal
which is needed to protect the insulation. Follow
instructions provided with the fireplace for all other
specifications and directions for proper installation
of the fireplace and hearth extension.
H2068 HEARTH EXTENSION H2068 HEARTH EXTENSION
OR EQUIVALENT
OR EQUIVALENT
20"
12" 12"
68"
F
IGURE
11
F
IGURE
12
53D9028. Rev 1 03/03