Think this fan will do? And i doubt this, but do you think it's plug n' play? BTW my grow box is 2' x 2.5' x 4.5'. http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100067594
those fans have very little static pressure to push air. The CFM rating is only boosted CFMs if only fan source its half of stated rating. This is the most cost effective option http://www.plantlightinghydroponics.com/valueline-inch-435-cfm-centrifugal-inline-fan-p-2260.html edit: or the 4" http://www.plantlightinghydroponics.com/valueline-inch-171-cfm-centrifugal-inline-fan-p-2259.html