https://communities.bentley.com/products/building/performance/f/hevacomp-forum/128703/rooflights---design-simulationHello, I&#39;m running some frequency simulations for areas that contain rooflights. I&#39;ve been asked to advise on how many rooflights should be openable, and by how much, to maintain a comfortable temperature in the space. What does the software meanen-USTelligent Community 12https://communities.bentley.com/thread/392704?ContentTypeID=1Tue, 22 Nov 2016 11:36:18 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:33631557-ab28-4317-8f8c-6a8c8d94d857Stephen Brown<p>Hi Andrew,<br /> <br /> Rooflight openings are assumed to be a flat opening based on a specific percentage of the rooflight area. For pivoting rooflight openings the Opening Factor should be determined from the window/rooflight opening angle, where the minimum opening angle is 0&deg; and maximum opening angle is 90&deg;.<br /> <br /> To calculate your Opening Factor simply divide the maximum opening angle by 90.<br /> In your case:<br /> Opening Factor : 20&deg;/90&deg; = 0.22</p><div style="clear:both;"></div>