The Hearth Sense Ventless Log Set features a traditional and classic style log look. This rich, hand-painted, cement log set made of superior refractory ceramics provides excellent details, emulating the realism of a wood fire. During the burn season and in the off season, the log set is an attractive accent to any room. This Log Set features a 30,000 BTU heat rating and Manual Controls for ease of use. It's the perfect log set for creating that great classical ambience for your home. The quality and efficiency of Vent Free Heating provides savings on your heating bill in addition to enhancing your home and hearth. This vent-free product may be used as a vented product. To operate as a vented product you must always operate the log set with the chimney flue damper open. You must install the damper clamp (included). This will insure vented operation.