The Reduced Clearance Square Ceiling Support Box supports chimney pipe and provides a positive connection between the support box and the chimney with a built-in twist-lock. This support box is suitable for both flat and cathedral ceiling applications, can also be used in short attic spaces. Will fit between standard 12" on center joists and most manufactured home applications and will
support up to 60 feet of DuraTech chimney pipe. An adapter can be used to attach DVL or DuraBlack to the support box. A 2' wide trim collar is included. The support is 24" long.
Stainless Steel inner and out shell. Stock Photo
5"-8" DuraTech is a double-wall, all-fuel chimney system for use with wood stoves, fireplaces, furnaces, boilers, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas, and zero-clearance fireplaces that are factory-built.
Materials and Construction
5”-8” diameter pipe features inner wall of .020” 430 stainless steel. Outer wall options of .016” 430 stainless steel or .021” galvalume steel.
A Thermal Tech (ceramic refractory) blanket insulation is encased between walls. Stainless steel end rings seal the pipe.
DuraTech features light weight insulation, twist-lock fittings, support boxes with factory installed starter sections, elbows with 360° swivel base, select black finish pipe lengths, and five foot length pipe sections.
2" clearance to combustibles.
UL Listed with DuraVent shroud specifications. Information available online or call and request L157.
c-UL-us Listed to UL 103 HT and ULC S604 (MH7399) (Stainless steel outer wall required for installation in Canada.)
WHAT IS ALL-FUEL? A system designed and built to exhaust wood, coal, oil, or gas fired low heat residential appliances. These systems are commonly called a "Class A chimney" or a "Factory built chimney". These are mainly used on free standing stoves, furnaces, and fireplaces. This product comes in double wall or triple wall construction. This type of system is listed to UL 103, UL 103HT, ULC S629, or ULC S604.
With a Thermal Tech blanket insulation encased between dual walls, DuraTech offers the optimum in safety and performance. It keeps the outer wall of the chimney cool, while ensuring high flue gas temperatures for optimum draft performance.
The inner wall is 25% thicker than competitive chimneys for an extra margin of safety. No locking bands or mechanical fasteners required.
DuraTech's sleek 1" wall design provides for easy installations through 16" on-center framing. For tight installations, a Reduced Clearance Square Ceiling Support Box is available (6" diameter DuraTech only).
Designed for normal, continuous operation at 1000°F flue gas temperatures, DuraTech is subjected to rigorous and stringent HT requirements of the UL standard, including one hour at 1400°F, plus three ten minute chimney fire tests at 2100°F.