Selkirk 283870 Thru-The-Wall Type L Pellet Stove Kit, 3", #3VP-KITModel VP Pellet Pipe for Pellet and Corn Stove Applications: Selkirk gives you the safe, efficient, and cost effective venting system that's engineered precisely for pellet and corn burning stoves. Model VP Pellet Pipe has been tested and listed by Underwriters' Laboratories, Inc., in accordance with UL 641 Standard for Low Temperature Venting Systems, as well as the applicable requirements from UL 103 Standard for Residential Type and Building