17
the vent pipe, and the combustible
surfaces of the enclosure. Do not ll
required air spaces with insulation.
(3) If venting system passes through
an attic space the Attic Insulation
Shield must be installed to prevent
contact between Pipe Sections and
the insulation or other debris. Nail the
base to oor of attic and adjust shield
for appropriate insulation level, then
attach the collar at the top of assembly
(Fig. 19). For vaulted ceilings, the
Attic Insulation Shield cannot be
installed. To prevent building insulation
and other debris from entering the
support box or contacting the pipe, a
chase enclosure can be constructed
around the support box. Ensure
proper clearance to combustibles
is maintained as prescribed by the
appliance manufacturer.
Figure 18
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