The Ductcap cover is designed to protect the entire air handling system during construction. Using a Ductcap cover to cover all unfinished ends, helps prevent moisture, dirt particles, dust and debris from entering the air handling system. The Ductcap cover is designed to be installed by stretching the elastic band over the round branch or any other open end. No tape, screws or nylon ties are needed to secure the Ductcap cover to the duct.