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The storm collar works together with the flashing to provide a weatherproof seal where the chimney penetrates through the roof the storm collar is installed directly above the flashing and must be sealed to the chimney using high temperature silicone sealant RTV 500 of or better features. Residential wood stoves fireplaces and furnaces. Oil coal natural gas propane burning appliances. Natural drafting building heating appliances. Zero clearance factory built fireplaces. Double wall chimney system for residential and building heating appliances. ETL listed by Intertek to the HT requirements of UL 103. High temperature thin fiber ceramic insulation blanket maintains superior draft performance specifications. Size 8 x 1262 x 325. Weight 055 lbs.