As it's say on the sticker capacity is 350 m3 per hour. I use as outake a 6" L1 systemair with a capacity of 680 m3 per hour and and as intake a 6" A1 systemair with a capacity of 420 m3 per hour in my tent (120cmX120cnX200cm) an it give me a good airflow. you also need to hear this fan running if the noise can be an issue for you....