DuraVent DuraPlus HTC - Manual (Page 23)

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lock Tee Cap into bottom of either the Tee or
Chimney Cleanout section.
6. Install Branch onto Tee: From inside the
home, attach a section of chimney to be used
as the branch for the Tee. Depending on your
wall thickness, you can use from a 6” section
up to a 24" section (see Wall Thickness
Chart). The Branch must be installed so that
it will be connected to the front-portion of
the Wall Thimble when it is installed, and the
Wall Thimble must extend at least 2” (50 mm)
into the room (Fig 24). The front portion
of the Wall Thimble must overlap the back
portion by at least 1” (25 mm). If your wall is
over 11” (275 mm) thick, then you must use
an Wall Thimble Extension which will allow
the Wall Thimble to be installed in walls up
to 18” (450 mm) thick. The Wall Thimble
Extension must overlap both the front and
back portions of the Wall Thimble by at least
1” (25 mm). Secure Wall Thimble Extension in
place by using (2) 1/2” (13 mm) sheet metal
screws to secure it to the back portion of the
Wall Thimble (Fig 24). Use high-temperature
sealant (500°F/260°C) to seal between the
Wall Thimble and the Chimney on the
outer wall.
7. Install front portion of the Wall Thimble:
Slide the Wall Thimble Cover over the front
portion of the Wall Thimble, and then install
the front portion of the Wall Thimble over
the back portion of the Wall Thimble or Wall
Thimble Extension. The front portion of the
Wall Thimble must be at least 2” (50 mm)
into the room and the starter section within
the front portion must twist locked into the
female end of the Branch (Fig 24). The front
portion of the Wall Thimble must also overlap
the back portion of the Wall Thimble (or the
Wall Thimble Extension) by at least 1” (25
mm). Using the (4) screws supplied, secure
the Wall Thimble Cover to the inside wall.
8. Complete Chimney: Attach the Chimney
Sections as in Step 7 in the Ceiling Supported
Installation section. Wall Straps (or Extended
Wall Brackets, where appropriate) must be
attached to the chimney at least every 8-feet
(2.4 m), and maintain at least 2” (50 mm)
clearance to combustibles. The Wall Straps
are adjustable to allow from 2”- 6” (50 mm
- 150 mm) clearance to combustibles from
the chimney. Mount the side brackets of
the Wall Strap onto the wall at the necessary
location using the (4) #8 1-1/2" wood screws
(or appropriate fastener for the surface).
Mount the band around the chimney pipe.
If the chimney is 7" or 8" in diameter, add in
the corresponding band section so the band
of the Wall Strap wraps completely around
the chimney. If the chimney is 6" diameter,
no additional band section is needed. Slide
the supporting bolts of the Band through the
slots of the Wall Strap bracket and adjust to
provide the clearance needed (Figures 23,
25). Slip the Wall Straps around the chimney,
tighten the bolts, adjust the clearance, and
fasten the Wall Straps to the wall with (4) #8,
1-1/2” long wood screws.
Once the chimney is at least at the minimum
height specified in Figure 1, attach the
Chimney Cap onto the top of the chimney
by holding it by the collar and twist locking
it clockwise onto the Chimney Pipe. If the
chimney penetrates an overhang, frame for
at least 2 inches (50 mm) of clearance, and
install Flashing and Storm Collar as described
in Steps 9 & 10 for Ceiling Supported
Installations. If the chimney extends more
wall Thickness Chart
BRAnCh length WAll thiCkneSS
(1) 6” SeCtion up to 5” thiCk
(2) 6” SeCtionS FRom 5 ½ “ - 9 ½ “
(1) 12” SeCtion FRom 7” to 11”
(1) 6” & (1) 12” SeCtion FRom 11 ½ “ - 15 ½ “
(1) 18” SeCtionS
FRom 13" - 17"
(2) 12" SeCtionS FRom 16" - 18"
(1) 24" SeCtion FRom 17 ½" - 18"