The room is about 3.5 metres by 2.5 metres approx and the tent is 1 metre by 1 metre.Yes but thats if the room is sealed. I doubt your room is basically air tight. I saw you ssid its in a room with no windows. Maybe I missed it but how big is your room, and how big is the tent?
I leave the door leading up to the room open to help with air exchange.
I will try adding a fan, even though my dehumidifier is running and blowing air out all the time.