QUOTE (moggggys @ May 8 2009, 02:51 PM)

yep its a speed controller which is normally hard wired and used with an inline 110mm fan , unless you have a fan thats over kill then its not alot of use in grows , much better is a temp controlled speed controller , they allow the fan to tick over with low revs when temps drop but speed up if temps rise only slowing once it cools down again
yeah, or for about 90 quid less you can buy a thermostat