480-1091 14 4-03
Constitution
EPA Certified Fireplace
ROOM ABOVE
ATTIC ABOVE
Figure 14A
Installing the Firestop Spac
er
CAUTION:
Firestop spacers must be used whenever the
chimney penetrates a ceiling/floor area.
24"
AS8 ATTIC
INSULATION
SHIELD
FS338
FIRESTOP
SPACER
CHIMNEY
INSULATION
10-1/2"
14-1/2"
Figure 14B
Installing an Attic Insulation Shield
6. Attic Insulation Shield
An insulation shield should be installed when there is a
possibility of insulation coming into contact with the factory
built chimney system. The insulation shield is installed by
positioning it over the vertical chimney section where it
penetrates a firestop spacer. The firestop spacer will support
the insulation shield. See Figure 14B.
5. Installing Firestop Spacers
Mark and cut out an opening in the ceiling for the firestop
spacer being utilized (14-1/2” x 14-1/2” for an FS338, 14-1/2”
x 18-3/8” for an FS339 and 14-1/2” x 23” for an FS340).
Frame the opening with the same dimension lumber used
in the ceiling joists.
Install the firestop spacer.
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 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
insulation from falling into the required 2” air space around the
chimney. See Figure 14A.
7. Double-checking the Chimney Assembly
Continue assembling the chimney sections up through the
firestop spacers as needed. While doing so, be aware of the
height and unsupported chimney length limitations that are
given on page 10 under “Chimney Requirements”.
Check each section by pulling up slightly from the top to
ensure proper engagement before installing the succeeding
sections. If they have been connected correctly, they will not
disengage when tested.
NOTE: Wiring for blowers must be done before
framed enclosure is completed. If using a Heat
Zone kit, it also must be installed before enclosure
is complete.
