User's Manual

050505-36 36ARB2 11
Wall thimble:
Where a vent pipe passes through a combustible wall, a wall
thimble/shield must be used to retain insulation and maintain
proper clearances. The wall thimble may be cut to length for
various wall thicknesses up to 12" thick.
Measure the wall thickness including the siding. Trim the
shield to match the wall thickness. Position the wall thimble
from inside through the 14-1/2" opening. Properly adjusted,
the thimble should be  ush with the outer wall surface.
TRIM TO LENGTH
WALL THIMBLE AND VENT
MUST NOT PROTRUDE
BEYOND SIDING
Fig. # 14
Fig. # 15