Save money too, with its 99.9% heat efficiency, since heat goes into the room, not up a chimney. Needs only 6" back clearance in addition to its already shallow 11-1⁄2" depth. Works with natural or LP propane gas (simply connect to available gas line); no electricity needed, so it works during a power failure. Features oxygen sensor that shuts fireplace off immediately if home oxygen levels get too low. Includes front grill, handpainted ceramic log set, piezo-ignition pilot light. Durable powder-coated steel. Minimal assembly needed. Meets ANSI Z21.11.2; AGA-listed components. Check your local ordinances regarding the use of ventless fireplaces. 31-1⁄2" wide, 25" tall overall. Allow 4 weeks for delivery. Please specify natural gas or LP.