Emergency Escape and Rescue Openings in The Current IRC codes can be searched on the internet! I linked one site here; https://codes.iccsafe.org/s/IRC2015/chapter-3-building-planning/IRC2015-Pt03-Ch03-SecR310 , 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: …