Extractor Fans are used in indoor growing to control temperature and to ensure a good airflow for your plants. In grow rooms we use fans to remove hot air from the environment and to bring in cool fresh air. Hot air rises so you want to mount you main extraction fan high up in the room where the air is hottest and then use a smaller extractor fan (about 1/3 to 1/2 as powerful) as an intake to bring cool air in at ground level, this will create a circulation effect which is what we are looking for.
Revolution EC Vector & AC Stratos Fans
At Hydro Hobby we stock the latest in EC (electrically commutated) Vector Fans the Revolution EC Vector Fan which uses combined AC and DC voltages to bring you the pinnacle of extraction fan technology - saving power consumption, giving off no humming or buzzing - whilst delivering higher quantities of air movement. Our other high quality extractor fans include Silenced Revolution EC Vector Fans, DiffuseAir Air Diffusers, Silenced Revolution AC Stratos Fans and RVK Fans.