The VRT4000Z Series Vent-Free gas fireplace systems combine hand-painted concrete logs, dancing yellow rear flame, glowing center ceramic fiber log and flickering ember bed for a realistic fireplace appearance. Includes Two tier burner with Ember bed, Radiant Firebox and Blower. Features Model # VRT4032ZEN. BTU/H 17,000 25,000. Style Traditional. Integrated log grate. Fuel Type Natural Gas. View Style Front View. Venting Type Vent-Free. Ignition Type Electronic. 99.9% heating efficiency. Highly detailed concrete logs. Two tier burner with ember bed. Factory installed heat activated variable speed blower. Durable textured powder-coat paint exterior/Std. black painted interior. 20 year limited warranty. Specifications Overall Dimensions 34.5 W x 16.75 D x 32 H . Framing Dimensions 34.87 W x 16.25 D x 36.75 H .