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