Compatible with AllFuel HST Class-A double wall chimney pipe. Can not be connected to other brands of class-A chimney. 304 Stainless Steel construction provides superior corrosion resistance over our competitors galvanized steel or 430 stainless steel construction. The storm collar is installed above your flashing to seal the installation and keep water out. The storm collar should be sealed to the chimney pipe with non-hardening 500 degree F high-temp sealant (sold separately) Certified to UL103HT and perfect for wood stoves, fireplaces, fireboxes, furnaces, boilers, water heaters, outdoor wood furnaces, or other residential heating appliances fueled by wood, gas, coal, or oil