All you need is an entrance for air! Don't really need a fan blowing in as long as you have a fan blowing air about the room!It'll save ya some on the electricity bill.

Ga Grown!
GaGrown Reviewed by GaGrown on . Ventilation Duct Fan For COOLTUBE Question I'm hoping to use it to make a cooltube for a 400w HPS, alternatively a 250HPS. Will this do? These are the specs: TD 160/100. 2 speed: 2500/2100 v/min. Effect 35/23 W. Decibel 39/35 dB(A). Max. air: 160 m³/tim. Rating: 5