DuraTech Product Catalog
Reduced Clearance 
Square Ceiling Support Box
A
HEIGHT
B
3”
C
C
Supports chimney pipe and provides a positive connection 
between support box and chimney with a built-in twist-
lock. Suitable for both at and cathedral (A-Frame) ceiling 
applications. Also use in short attic spaces (see instructions). 
Fits between standard 12” on center joists and most 
manufactured home applications. Supports up to 60' of 
DuraTech Chimney. Use adapter to attach DVL or DuraBlack to 
the support box. A 2” wide trim collar is included. Painted black. 
(For adapters see DVL/DuraBlack section).
SIZE 6”
A
6 ⁄”
B
9”
C
10”
HEIGHT
24”
ORDER #
6DT-CS24R
STOCK #
810000101
Combustion Air 
Square Ceiling Support Box
A
Table
øA
B C
6
24
14  5/16
6 36
14  5/16
8
24
14  5/16
8 36
14  5/16
14⁄”
18⁄”
Use with Combustion Air System components. Delivers outdoor 
air as combustion air to the appliance. Operates as a direct vent 
system without requiring a second penetration to the building 
envelope. Black. Patent-pending. For pricing refer to the CAS 
price list.
SIZE 6” 6” 8” 8”
A
24” 36” 24” 36”
ORDER #
6CAS-CS24DT 6CAS-CS36DT 8CAS-CS24DT 8CAS-CS36DT
STOCK #
810000867 810000869 810000881 810000883
Square Ceiling Support Box w/ 
Collar *new product* 
A
HEIGHT
B
3”
C
C
Use with at, vaulted or cathedral ceilings where there is an attic 
space above. Supports can carry up to 40’ of DuraTech Chimney. 
The additional Insulation Collar now enables the support box 
to be qualied as an Attic Insulation Shield. The additional Attic 
Insulation Shield (DT-AIS) is not required with these support boxes.
SIZE 6”
A
6 ⁄”
B
9”
C
12”
HEIGHT
24”
ORDER #
6DT-CS24IS
STOCK #
810009648
36”
ORDER #
6DT-CS36IS
STOCK #
810009649
 800-835-4429 | DuraVent
20
All-Fuel Chimney | DuraTech 5”- 8”










