Instruction

16
Box into the framed opening so the square
portion projects at least 2” below the nished
ceiling and rafters (bottom of round portion is
5” below, Fig.7), and extends above the ceiling
to framing or decking materials to which it can
be nailed. Level the Support Box, and slit
the corners to the rooine where they extend
beyond it. Bend the aps (created by the
slitting) ush with the roof, and nail the Support
Box to the roof or framing with at least three
(3) 8-penny nails, or (3) 1-1/2”, #8 screws, per
side (Fig.21). Be sure to keep the Support
Box level. Screw the trim sections into the
ceiling (Fig.9). Refer to step 3-A of the Ceiling
Supported Installation instructions if you
choose to insulate the Support Box.
A3. Complete Installation: Refer to Steps 7,
9 & 10 in the “Ceiling Supported” section to
complete the Roof Supported install. Non-
combustible insulation as specied on page 4
may be added to the Support Box.
(B) Roof Support: A Roof Support may be
used in installations where there is a cathedral
ceiling, and a Square Ceiling Support is
not desired. The Roof Support allows the
DuraTech chimney to come down into the room
below the level of the ceiling (Fig.23). The
Roof Support can support a maximum of 30’ of
DuraTech Chimney total, with maximum of 10’
above the support (Table 2). If a taller stack of
DuraTech Chimney is required, you must use a
Square Ceiling Support Box instead.
B1. Place Appliance: Step 1 from “Ceiling-
Supported” method detailed earlier.
B2. Cut Openings: Cut and frame openings to
provide a minimum 2” clearance on all sides of
the chimney pipe. Note: Opening in nished
ceiling should be circular/oval in order for it to
be covered by Trim Collar.
B3. Install Roof Support: Bolt on the Roof
Support Brackets to the Roof Support Band
using the supplied hardware. Attach the Roof
Support Brackets to roof using (4) 8 penny
nails or (4) #8, 1-1/2” screws per side (Fig.23).
B4. Assemble Chimney Sections: Determine
how much DuraTech Chimney will be extending
into the room (minimum of 3” below the ceiling).
Be sure to maintain the proper clearance
to combustibles (walls and ceilings) for the
connector pipe. Once you have identied the
proper height for your installation, attach the
Roof Support Band to the Chimney Section by
tightening the Bolt, and secure it by using (4)
supplied sheet metal screws. Attach desired
length of Chimney above the roof level, max. of
30’ total, 10’ above the support (Table 2) .
B5. Transition to Connector Pipe: Attach the
Finishing Collar by twist locking it to the bottom
section of DuraTech Chimney. Then, slide Trim
Collar over the DuraTech Chimney and attach
the Trim Collar to the ceiling using (4) 1-1/4”
screws provided (Fig.23).
B6. Finish Installation: Refer to Steps 10 & 11 in
the “Ceiling Supported” section to complete the
Roof Supported installation.
Alternative Installation for Roof Support:
The Roof Support may be used at the bottom
of a Chimney installation (Fig.22). This may
be useful for some basement installations.
Maintain a minimum of 2” clearance to
combustibles at all times. The DuraTech
Chimney needs to extend a minimum of 3”
below the nished ceiling or exposed framing
members. Please note that you cannot extend
the chimney all the way to the appliance - you
must use connector pipe.
1. Complete Steps B1-B3 from Roof Support
Section. For Step B3, rather than installing
the Roof Support on the roof, attach the Roof
Support Brackets to oor using (4) 8 penny nails
or (4) #8, 1-1/2” screws per side (Fig.22).
2. Complete Step B4 from Roof Support
Section.