This item cannot be shipped to the following state(s): GU,PR,VI
The Pellet Vent flex section is used to bend around the smoke shelf in a masonry chimney insert installation. It is not to be used any where else. The heist lock connectors attach the flex to the insert and the to the rigid pellet vent pipe after the flex passes the smoke shelf. 4in. Pellet Vent is used in high altitude installations or installations that exceed 15 ft. in height. High altitude is considered 4500 ft..