https://communities.bentley.com/products/building/performance/f/hevacomp-forum/170462/air-change-ratesHi, In the CAD input within thermal design within the a/c rate this is where we are inputting the infiltration rate of the building. When it comes to the heatloss section where we are selecting the fixed air supply temperature and then inputtingen-USTelligent Community 12https://communities.bentley.com/thread/489768?ContentTypeID=1Tue, 06 Nov 2018 15:44:10 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:14bdcc6a-5c75-4f3a-9504-ad24617d17f4Duncan Brown<p>Hi George - You cannot specify different figures. You would need to run each room calculation on an individual or group of rooms&nbsp;basis, and then add up the plant loads after running all the rooms you required.<br /><br />Regards,</p><div style="clear:both;"></div>