Isokern Standard 36 - Fire-Lite Application - Required Clearance to Combustibles

FTF 13
Metal Chimney
(or equivalent)
2” min. 2” min.
1 ½” min. to
Combustible
Framing
Fire-Lite Stand
(4” min)
Combustible
Floor System
1 ½” min.
Noncombustible
Hearth Extension
Zero Clearance
20” min
Hearth Extension Support with
Noncombustible Material.
*8 1/2”
min
20” min
3” min When
Unsupported
1 1/2”
Min
12”
min
12”
min
1 1/2” min
When Supported*
Plus width of backing
Combustibles Must
Have 1 1/2”” min
Clearance
Combustibles Must Have 1 1/2”” min
Clearance.
DO NOT ENCROACH ON
CLEARANCE WITH COMBUSTIBLES!
1 1/2”
1 1/2”
CORRECT
INCORRECT
* Height based on the use of 1 1/4” fire-brick and a 1/4” mortar bed.
This height may vary based on the firebrick used.
Fire-Lite Application - Required Clearance To Combustibles
The Fire-Lite is tested and listed for installation with
“clearance to combustibles” as follows:
1) Four inches (4”) clearance to the combustible oor.
2) Zero inch (0”) clearance at the Isokern smoke dome front wall
(Figure 77).
3) One and one half inches (1-1/2”) clearance at the Isokern rebox
back walls and side walls.
4) Two inches (2”) minimum air space to combustibles at all FTF-
13 metal chimney components’ outer layer.
Important: “Combustibles” are dened as “normal construction
materials” and are considered to be: wood framing materials,
particle board, mill board, plywood sub-ooring, plywood paneling
and wood ooring. Sheathing materials, such as plywood, particle
board and drywall may cover the smoke dome front at zero inch
(0”) clearance. All combustible sheathing materials must be held
eight inches (8”) away from the sides of the rebox opening and
eight inches (8”) above the top of the rebox opening.
The rebox backwall, side walls and the smoke dome back
require 1 1/2” clearance. (Figures 80 & 81)
Keep all insulation, vapor barriers, “house wrap” paper and
other insulating type membranes and products, including
berglass, cellulose and other insulation, (anything that carries
an “R” rating) a minimum of three inches (3”) away from all
rebox and chimney surfaces.
Exception: If insulation is used in walls surrounding the replace,
insulation may be installed behind sheathing of gypsom board,
plywood, particle board or other material on the side facing the
Isokern. (Figure 81)
The sheathing material holding back the insulation cannot be
closer than 1 1/2” to the replace sidewalls, backwall or chimney
system. (Figure 83)
When Fireplace installations are surrounded by walls
that are to be insulated, the walls must have enough clearance to
the Isokern unit in order to maintain the three inch (3”) minimum
clearance to insulation for unsupported insulation. Never spray the
Fireplace or chimney system with any type of sealer, insulation
or other material.
Notes:
The Fire-Lite Application is designed, tested and approved
for installation at a minimum of four inches (4”) above combustible
oor systems per the installation specications given in this manual.
Any portion of the combustible oor system left exposed
under the base plate is to be covered with minimum 1” thick
ceramic ber insulation board or equivalent rated to 2100 degrees
Fahrenheit (Figure 79).
All Fire-Lite Series result in the nished re brick oor
of the rebox being at least eight inches (8 1/2”)* above the
combustible oor system (Figure 80).
48
FIGURE 80
FIGURE 81
FIGURE 82
FIGURE 83