Instruction

9
Figure 10
CAP
ADJUSTABLE
FLASHING
CHIMNEY
SECTION
ATTIC
INSULATION
SHIELD
STORM
COLLAR
FIRESTOP
RADIATION
SHIELD
CHIMNEY
SECTION
FRAMED
ENCLOSURE
2 INCH MIN
CLEARANCE
TO INSIDE OF
ENCLOSURE
REF FIG. 7
18 INCH MIN FOR
SINGLE WALL
STOVEPIPE
Figure 11
FRAMING
FIRESTOP
RADIATION SHIELD
4. Frame Openings: Frame openings in
each ceiling or oor above the Support Box
(Fig.10). These openings are to hold the
Firestop Radiation Shield and Attic Insulation
Shield. Locate each opening by dropping a
plumb bob to the four corners of the opening
below. Maintain the framing dimensions as
specied in Table 1. Warning: other than the
framing for the Reduced Clearance Support
Box, any combustible materials around
the chimney must meet the minimum 2”
clearance requirement. If Elbows must be
used to avoid an obstruction, refer to the Offset
Elbow Installation section.
framing members using the (6) 1-1/4” round
head wood screws provided (Fig.9).
• 3-A. When installing a Support Box into a
roof, non-combustible insulation adhering to
the specications on page 4 may be added
to prevent cold/outside air intrusion and limit
condensation on the surface of the Support
Box. Cut the insulation into squares as
shown in Figure 9a, or wrap the pipe with
an insulation blanket and ll in the corners
as shown in Figure 9b. Do not compress
the insulation more than 25% or you may
adversely affect the thermal resistance of
the insulation. Non-combustible insulation is
allowed up to the top edge of the Support Box,
but not go past the edge where it can fall out
or come in direct contact with combustible
materials.
5. Cut Roof Opening: Cut an opening in the
roof directly above the opening below, and
at least 4” larger than the chimney’s outside
diameter to provide at least a 2” clearance all
around the chimney. The chimney must be
centered within this opening and maintain the
2” clearance to combustibles.
6. Install Firestop Radiation Shield: A Firestop
Radiation Shield is required in multistory
installations at each oor penetration above
that where the Support Box is located.
Example: in a multistory home where the
appliance is on the ground oor (Support
FRAMING
UNOCCUPIED
SPACE