5", 5RV-RTf, Round, Type B, Gas Vent Top. Top round forgravity draft venting of LP or natural gas burning appliances. This is not forwall furnaces or wood burning applications. Inner wall aluminum, outer wallgalvanized. 100 million BTU per hour. 500 F maximum. External screen preventsentry of most bird species. From the Manufacturer 5", 5RV-RTf, Round, Type B,Gas Vent Top. Top round for gravity draft venting of LP or natural gas burningappliances. This is not for wall furnaces or wood burning applications. Innerwall aluminum, outer wall galvanized. 100 million BTU per hour. 500 F maximum.External screen prevents entry of most bird species.

5", 5RV-RTf, Round, Type B, Gas Vent Top Top round for gravity draft venting of LP or natural gas burning appliances Not for wall furnaces or wood burning applications Inner wall aluminum, outer wall galvanized External screen prevents entry of most bird species