Just completed, 1500w remote control fireplace. Removed nonfunctional doors, moved speaker to the side mounted on a plywood panel with a 20A GFI connected to a docking port installed into outside giving me an additional 20amps via a 12ga. Cord plug into the pedestal.
Bought the fireplace with mantle a couple years ago at Kmart for around $160. Box is 18x16x4" deep. Would have liked to put in an infrared box, but the smallest I could find was 23x20x8" deep which would barely clear the slide when pulled in and I just wasn't happy with the clearances required. I can remove a couple screws and post the brand and model # later today or tomorrow