Vortex Acoustic Fans move serious amounts of air…quietly! Using high quality components the Vortex Acoustic Fans will extract air from your grow room quickly and efficiently whilst keeping noise to a minimum. By using an acoustic foam lined chamber, sound from the powerful internal fan is minimised, whilst still moving a huge amount of air! They each come with a built in adjustable fan speed controller so airflow can be easily managed with the turn of a dial.