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Review the step-by-step directions before
beginning your installation.
CEILING SUPPORTED
1. Place Appliance: Position the appliance
according to the manufacturer's instructions.
The flue outlet collar should be placed
between the rafters or joists above,
if possible.
2. Frame Support Opening: Use a laser
level or drop a plumb bob to the center of
the appliance's flue outlet and mark this
center point on the ceiling. Refer to Table 2
for framing dimensions. Mark a cutting line
around the center point to the dimension
required in Table 2. Cut a square hole in the
ceiling for the Support Box. Frame a level,
square opening centered over the hole which
you have cut. (Figures 3 and 4).
3. Install Support: For installation into a
flat ceiling, you may use a Square Ceiling
Support Box, a Round Ceiling Support Box, a
Reduced Clearance Support Box, or the CAS
Ceiling Support. Note: each of the Ceiling
Supports act as a firestop at the ceiling level;
an additional firestop is not needed at that
level. Each Ceiling Support can support a
maximum of 40-feet (12.2 m) of chimney.
The CAS Ceiling Support is only used when
installing the CAS system. Refer to the
DuraPlus HTC CAS Installation Instructions for
directions on how to install the remainder of
the Combustion Air System. For the Square
Ceiling Support Box, refer to the cathedral
ceiling installation below. The bottom of the
Round Ceiling Support must extend at least
3 inches (75 mm) below the finished ceiling.
Level the Ceiling Support and secure it to the
framing using at least three 8-penny nails per
side (min. of 12 total). Alternatively, you may
use 1-1/2" #8 wood screws (min. of 12 total),
instead of nails. Next, secure the two-piece
Trim Collar to the framing members using
the (6) 1-1/4" long, round-head wood screws
provided (Fig 6).
DuraPlus HTC Component
Square Ceiling Support Box
Round Ceiling Support Box
Reduced Clearance Support Box 12-1/4"
CAS Ceiling Support
Wall Thimble
CAS Wall Thimble
Firestop Radiation Shield
Reduced Clearance Firestop
Radiation Shield
DuraPlus HTC Support
Square Ceiling Support Box
Reduced Clearance Square
Ceiling Support Box
CAS Ceiling Support Box
Round Ceiling Support
Roof Support
Tee Support
Tee Re-Support
Extended Wall Bracket
For installation into a cathedral ceiling, you
must use the Square Ceiling Support Box,
Reduced Clearance Support Box, or the CAS
Ceiling Support and the two-piece Trim. The
bottom of the square portion of the Support
Box must be a minimum of 3 inches (75 mm)
lower than the finished ceiling at the lowest
side of the penetration (Fig 5 & 6). Level the
Support Box . Support Box Guide Rails are
available for Cathedral Ceiling Support Boxes
to help ensure the Support Box is level during
installation. Before installing the Support Box,
align the Guide Rails level onto the Support
Table 2
Framing Dimensions
14-1/2"
370mm
14-1/4"
362mm
312mm
14-1/2"
370mm
14-1/4"
362mm
14-1/4"
362mm
14-1/2"
370mm
12-1/4"
312mm
Table 3
Chimney Height Supported
6"
7"
40-ft
40-ft
40-ft
40-ft
40-ft
40-ft
40-ft
40-ft
30-ft
30-ft
35-ft
30-ft
30-ft
25-ft
35-ft
30-ft
8"
40-ft
40-ft
40-ft
40-ft
30-ft
25-ft
25-ft
25-ft
7
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