Isokern Standard 36 - Required Clearances (When Sheathing Protrudes Beyond Front of Firebox)

Combustible sheathing such as plywood and particle board may be used to cover the front face of the smoke dome and be
in direct contact with it. If sheathing protrudes in front of the rebox, application of such combustible sheathing must assure that
the sheathing is held a minimum of eight inches (8”) away from each side of the nished rebox opening and a minimum of eight
inches (8”) above the top of the nished rebox opening. (Figure 29 & 30)
Do not build a combustible framed wall out in front of the rebox.
If sheathing and framing are to be installed across the front face of the rebox smoke dome, then the framing and sheathing
must be held a minimum of eight inches (8”) above the top of the rebox opening. This means that framing and sheathing across the
smoke dome front must be kept at or above the damper beam.
Required Clearances (when sheathing protrudes beyond front of rebox)
22
FINISHED OPENING
8”
MIN
8”
MIN
WOOD (COMBUSTIBLE)
SHEATHING
8”
MIN
8”
MIN
8”
MIN
FIRE
BRICK
Noncombustible
Facing
1 1/2” MIN TO
COMBUSTIBLE FRAMING
Plywood
Sheathing
FIGURE 29
FIGURE 30