question about carbon filter

I am going to purchase a carbon filter.. How important is it that I get the inline fan as well?

Uhhh..if you don't have a fan pulling air thru the carbon filter why have the filter. Man, I'm really confused now. VV

it's cructial. If you dont have a fan, the CF will just sit there takin up room. Connect the filter's end ( the hole end) to the fan via some ducting and then duct the other side of the fan to lead out of the grow room. Air is sucked into the side of the CF by the fan and then pumped outside

CF-----Fan------Outside

anyone know a good place to get good deal on a filter / fan combo