DuraVent DuraTech 5-8 - Manual (Page 16)

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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).
A3. Complete Installation: Refer to Steps 7,
9 & 10 in the “Ceiling Supported” section to
complete the Roof Supported install.
(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 finished
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 identified 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 finished 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 floor using (4) 8 penny nails
or (4) #8, 1-1/2” screws per side (Fig.22).
2. Complete Step B4 from Roof Support
Section.
3. Install a Firestop Radiation Shield below the
finished ceiling or framing members. Trim the
‘tube’ portion of the Firestop Radiation Shield
as needed if it interferes with the Roof Support
Installation (Fig.22).
4. Follow steps B5 and B6 from the Roof
Support section.
METHOD 3: TEE-SUPPORTED
INSTALLATIONS
Tee-Supported installations are used when
passing through a wall to a chimney. The
Tee Support can hold a maximum of 60’ of