12" DuraVent DuraChimney II Chimney Cap 12DCA-VC1 This chimney cap is used to terminate the chimney system and to keep rain and debris out of your flue. Required on all installations. Slides over the previous section of DuraChimney II pipe to allow for chimney height adjustment. Includes a spark arrestor to prevent sparks from jumping out of flue. Approved for wood coal oil and Category 1 gas 430-alloy inner wall 021" galvanized outer Double-wall air cooled chimney system 2" clearance to combustibles Factory-built alternative to pre-fabricated masonry chimneys Lightweight design which eliminates the need for field assembly of pipe sections allowing for faster installation Tested and listed for continuous operation at 1000 ° F flue gas temperatures one hour at 1400 ° F and ten-minutes at 1700 ° F .016†430 stainless steel inner wall and .021†galvanized steel outer wall. For stainless steel outer wall