The gas vent termination kit, round, type b, 5-in., 4-pc. is designed for venting approved gas appliances in residential and light commercial applications. this 4-piece kit includes a top, flashing, storm collar, and draft hood connector. the inner liner is constructed from aluminum, while the outer material is 28 gauge galvanized steel. it is suitable for use with water heaters, furnaces, and stoves. the kit features a locktab method to secure pipe when required by local code. it complies with underwriters laboratories ul 441, national fire protection agency nfpa 54, and nfpa 211 standards. the dimensions are 10.40" in height, 17.80" in length, and 14.50" in width. this kit is intended for chimney repair and maintenance tasks. please check appliance installation instructions for specific details regarding your setup. the combination of aluminum and galvanized steel provides a functional solution for gas venting requirements in various building types.