No fans directly on the plants. There's a small clip on near an opening to bring in fresh air and passively vented to flower chamber (fan running carbon filter pulls air from veg via duct).
Temp ranges from 20C to 27C if it gets very hot during the day.
Humidity from about 30% on the very low end to 70% on the very high (if it rains all day etc) but usually between 40-60%.