AmeriVent Model HS/HSS All-Fuel Chimney
Installation Instructions
3. Firestop Assembly Cat. No. 6, 8 HS-FSA
NOTE:
Firestop assemblies are required in dwellings
wherever the chimney passes through floors above
the ceiling support. A ceiling support is used only
in the ceiling directly above the appliance, and
firestop assemblies must be used at all other floor
levels. Firestop assemblies maintain proper
clearances between chimney and combustible
material. Prepare an opening in the ceiling
according to the chart in Table 1. This opening
must be framed on all four sides. Assemble
chimney sections up to firestop opening.
a. For all floor levels above ceiling support, with the exception
of attic, guide firestop assembly over chimney section
below with spacer flange toward joist (see Figure 5).
Complete assembly of pipe through joist. Push firestop up
against bottom of ceiling with spacer into joist opening.
Nail firestop in place with three (3) nails on each side.
b. On attics where chimneys are enclosed or where the attic
insulation shield is used (see Section 4), the firestop must
be installed on the top of joist in the same manner
described in Section a.
4. Attic Insulation Shield Cat. No. 6, 8 HS-AIS
If the chimney passes through an attic space, one of the
following methods must be used to prevent building insulation
from infringing on the required 2-inch airspace to combustibles.
NOTE:
On new construction, the chimney should be
enclosed (or insulation shield installed) before
installing insulation.
a. Completely enclose the chimney where it passes
through the attic space, maintaining at least 2 inches of
airspace clearance (see Figure 6) after installing firestop
assembly as in Section 3.b.
b. Install an attic insulation shield on the top of the joist
(see Figure 7).
NOTE:
Attic shield is 18 inches high; therefore, if there is 18
inches or less clearance from roof in the area where
chimney is located, the chimney must be totally
enclosed instead of using attic insulation shield.
1) Slide the double-wall attic insulation shield down around
the chimney, with the flat plate sitting either directly on the
joist above the ceiling support or on firestop assembly.
2) Position attic shield collar around pipe tightly, and push
down onto double-wall attic insulation shield to prevent
loose insulation from entering the 2-inch airspace.
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