Will the Lerwick optiflame 3D remote control electric fire fit into an opening 590 high and 420 wide

Thanks for your enquiry.

Yes, the Dimplex Lerwick Optiflame electric fire should fit within your fireplace. It is designed to fit a standard 16" (W) x 22" (H) fireplace opening, which is approximately 40.6 cm (W) x 55.9 cm (H).