Hi Crash, thank you for your inquiry. The Duluth Forge 40 in. Ventless Dual Fuel Gas Fireplace in Antique White with Thermostat is not designed to be installed in a corner; however, it can be installed in a corner at your discretion. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot!
Yes, Home Depot sells fan kit FIB100.
No, it does not fit flush to the wall.
I have not installed it yet waiting till after Christmas . I measured the fire box while it was still in box and came up with 26 in. wide x 23 in. tall and about 13 in. deep not exact measurements but close. complete unit 40 in x 40 according to Duluth Forge.
The firebox measures 40" H x 40" W.