The BRT4000 B-Vent Fireplaces feature multidimensional refractory log arrangement and deep glowing ember bed. An aluminized tube dual burner provides real wood-fire ambiance with 40,000 BTU. The BRT4000 ships smooth faced and include hidden screen pockets, easy access flue damper with safety shut-off switch, and white refractory. Includes white brick hearth. Features Max Heat Output 40,000 BTUs. Fuel Natural Gas. Vent Style B-Vent. Radiant Clean Face. Ignition Type Millivolt. Dual tube burner uses 6 b-vent. Dramatic yellow flames with glowing ember bed. Detailed ceramic fiber split oak log set with log grate. White stacked refractory panel interior sides, back and hearth . Screens retract into hidden screen pockets. Hidden gas controls with damper safety switch. Durable textured powder coat finish. Optional outside air kit for increased performance. Optional remote controls available for all models. Dual access pre-wired electrical J-box. 20 year limited warranty. Specifications Overall Dimensions 42 W x 21.25 D x 37 H . Framing Dimensions 41.25 W x 21.37 D x 40.37 H .