Emergency Escape and Rescue Openings in The Current IRC codes can be searched on the internet! I linked one site here; https://windowanddoor.com/article/januaryfebruary-2019/2018-international-code-requirements-windows-doors, so in short it states that you need 5.7 square feet (820 sq inches) of window opening at least 24″ high and 20″ wide of an operating window to meet code. Exception: Grade …