RHW-44 WOODBURNING FIREPLACE
3-00
15 33147A
Figure 12
Connecting Chimney Sections
Figure 13
Installing the Firestop Spacer
STEP 7 - Installing an AS8 Insulation Shield.
An AS8 insulation shield should be installed when there
is a possibility of insulation coming into contact with the
factory-built chimney system. The AS8 is installed by
positioning it over the vertical chimney section where it
penetrates an FS338 firestop spacer. The FS338 will
support the AS8. See Figure 14. When the factory-built
chimney penetrates an insulated ceiling at either 15 or
30 degrees from vertical, an insulation dam should be
constructed from plywood or sheet metal. A minimum
2" air space must be provided between the insulation
dam and the factory-built chimney system.
STEP 5 - Preparing the Ceiling for Firestop
Spacers.
Mark and cut out an opening in the ceiling for the par-
ticular firestop spacer being utilized (14-1/2" x 14-1/2"
for an FS338, or 14-1/4" x 18-3/4" for an FS339, or
14-1/2” x 23” for an FS340). Frame the opening with
the same dimension lumber used in the ceiling joists.
STEP 6 - Installing the Firestop Spacers.
Install the firestop spacer FS338 (Straight), FS339 (if
a 15° offset is located in the ceiling joist area), or
FS340 (if a 30° offset is located in the ceiling joist
area). Nail the four sides of the firestop spacer to the
joists using a minimum of three [3] nails per side.
These firestop spacers are designed to provide the
minimum 2” air space required around the chimney.
In all situations, the firestop spacers are to be nailed
NOTE: The
inner flue is
placed to the
inside of the
flue section
below it. The
outer casing is
placed outside
the outer casing
of the chimney
section below it.
See Figure 12.
STEP 4 - Assembling Chimney Sections.
Attach either a straight chimney section or an offset
to the top of the fireplace depending on your installa-
tion requirement. Chimney sections are locked
together by pushing downward until the top section
meets the stop bead on the lower section. When
using offsets/returns, it is highly recommended that
the offset and return sections be secured in place
with screws to ensure proper orientation.
See Figure 11.
CAUTION:
INNER FLUE AND OUTER LINER SEC-
TIONS CANNOT BE DISASSEMBLED
ONCE LOCKED TOGETHER.
PLAN
AHEAD TO INSURE THE PROPER INSTAL-
LATION HEIGHT IS ACHIEVED WITH THE
SELECTED CHIMNEY COMPONENTS.
Figure 11
Connecting Chimney Sections
to the ceiling joists from the bottom or fireplace side,
EXCEPT
when the space above is an insulated ceiling
or attic space. In this situation, the firestop spacer
must be nailed from the top side to prevent loose insu-
lation from falling into the required two inch air space
around the chimney. See Figure 13.
Firestop spacers must be used whenever the chimney
penetrates a ceiling/floor area.