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 # VRT4036ZEP. BTU/H 20,000 33,000. Style Traditional. Integrated log grate. View Style Front View. Venting Type Vent-Free. Ignition Type Electronic. 99.9% heating efficiency. Fuel Type Liquid Propane. 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. Specifications Overall Dimensions 41.13 W x 21.25 D x 36 H . Framing Dimensions 41.25 W x 20.75 D x 40.5 H .