(2) Active Air 6" 5W Magnetic Drive Clip On Grow Fans w/ Brushless Motor | HORF6 5W direct drive magnetic engine clip fan Low 5W consumption means users can save on their electricity bills Brushless motor lasts longer than conventional clip fans that use oil to lubricate rotation This fan does not have built-in speed controls, but can be hooked to fan speed controllers, such as ACSC Will withstand extreme changes in grow room conditions 24/7