9
Required Clearance to Combustibles
Important: “Combustibles” are dened as “normal construction materials” and considered to be: wood framing materials, particle
board, mill board, plywood paneling, plywood subooring and wood ooring.
The IBV is listed for installation with “clearance to combustibles” (shown below) as follows:
A: Zero inch (0”) clearance to the combustible oor; (Isokern Base Plate must be used)
B: Zero inch (0”) clearance at the Isokern rebox sides and front and smoke dome sides and front;
C: One and one half inches (1-1/2”) clearance at the Isokern rebox back wall and smoke dome back wall;
D: One inch (1”) minimum air space to combustibles at all B-Vent double wall chimney components’ outer layer.
(Contact pipe manufacturer for specic clearance information)
CAUTION: Maintain three inches (3”) clearance to insulation and vapor barriers from all rebox, smoke dome and B-Vent ue
components’ outer layer.
Notes:
1. The IBV is designed, tested and approved for installation directly on a combustible oor system per the installation specications
given in this manual.
2. All IBV installations will result in the minimum nished re brick oor of the rebox being at least four and one half inches
(4-1/2”) above the combustible oor system. For ush hearth installations, consult your local representative.
3. The combustible oor in front of the replace must be covered with a noncombustible hearth extension material set tight against
the replace front and extending at least twenty inches (20”) out from the nished front of the replace and at least twelve inches
(12”) beyond the nished sides of the replace opening (See page 28).
WARNING: Combustible objects placed in front of the replace must be kept to a minimum of forty eight inches (48”) clearance
to the replace opening.
B
A
B
B
D
D
D
C
Combustible
Floor System
(non-insulation)
Hearth Extension
(non-combustible)
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