SELKIRK Corp 244012 4x12 Pellet Stove Pipe Product Description 4" x 12", 4VP-12, Pellet Stove Pipe. Type L vent tested and listed to UL-641 and UL-103 standards. Use to vent pellet appliances. Pellet vent cannot be interchanged with other manufacturer systems. Double wall and insulated design. Designed with a stainless steel inner wall and a 0.018 galvalume steel outer wall. 1" inch clearance to combustibles twist-lock construction . From the Manufacturer 4" x 12", 4VP-12, Pellet Stove Pipe. Type L vent tested, and listed to UL-641, and UL-103 standards. Use to vent pellet appliances. Pellet vent cannot be interchanged with other manufacturer systems. Double wall, and insulated design. Designed with a stainless steel inner wall, and a 0.018 galvalume steel outer wall. 1" inch clearance to combustibles twist-lock construction . Features 4" x 12", 4VP-12, 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 USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.