Dura-Tech 36 Inch Square Ceiling Support Box - 6 Inch Drop - Heavy Duty Metal Electrical Junction Box for Commercial & Residential Wiring - Perfect for Ceiling Fans, Lights, and HVAC Installations

Diameter: 6 inches. Construction Material: 430 Stainless Steel Inner Wall, 0.021" Galvalume Steel Outer Wall. Clearance: 2" combustible clearance. Listings: c-UL-us Listed to UL 103 and ULC S604 (MH7399). Painted black. Factory-installed twist-lock hardware. DuraTech square roof support box supports pipe chimney and provides a positive connection between the support box and the chimney pipe with a built-in twist lock feature. This ceiling mount is suitable for both flat and cathedral roof applications and can also be used in short attic spaces. Designed for appliances tested and listed for use with a 2100 degree F HT chimney system, such as wood stoves, fireplaces, furnaces, boilers, ranges, ranges, water heaters or other appliances fueled by wood, oil, coal or gas This roof mount fits between 16 inches in center joists and most mobile home applications and supports up to 60 feet of DuraTech chimney. A 2-inch wide trim collar is included. DuraTech is a double-walled, fuel-fired chimney system for use with wood-burning stoves, fireplaces, furnaces, boilers, ranges, water heaters or other appliances fueled by wood, oil, coal or gas, and zero-gap fireplaces that are factory built. With an insulating thermal blanket between duel walls, DuraTech offers superior safety and performance. Keeps the outer wall cool while ensuring high flue gas temperatures for optimal stall performance. The interior wall is 25% thicker than competitive chimneys, for an extra margin of safety. Designed for normal, continuous operation at flue gas temperatures of 1000 degrees F, DuraTech is subject to the rigorous and stringent HT requirements of the UL standard, including one hour at 1400 degrees F, plus three ten-minute chimney fire tests. minutes at 2100 degrees F.