SELKIRK CORP 244036 4x36 Pellet Stove Pipe Manufactured in China Easy to use Highly durable 4" x 36", 4VP-36, Pellet Stove Pipe Type L vent tested and listed to UL-641 and UL-103 standards Use to vent pellet appliances Double wall and insulated design Designed with a stainless steel inner wall and a 0.018 galvalume steel outer wall