Hello! I tried to follow the exemple file to connect the ventilated slab to the thermalZone, but i think it's not connected, because the result of the Air Mass flow rate its zero whole Year. Can you pleasse take a look and your comments will help me This is the link on drive : https://usherbrooke-my.sharepoint.com/:u:/g/personal/bela2118_usherbrooke_ca/EXrhhrbbhrNKjpLgd5hzd8ABhFV_aOaFa_FS4-AeSx-s0w?e=elshyX Thank You