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**farmergiles** · 10-18-2009, 03:34 AM

You can use a fan from a ceiling exhaust, usually they fit 4" duct.

They won't move as much air as a decent fan designed for horticultural use and they will be noisier and may be less reliable. Having said that, if there is no other air exchange from the grow space this type of fan could be useful.
It's not too much more for a decent fan though, especially if you're planning to use a 600w light.

Make sue you get one which isn't on a timer.

10-18-2009, 03:34 AM	#3 (permalink)
farmergiles Yahookan Join Date: Sep 2006 Location: In My Fire Engine Posts: 7,134 Thanks: 2,040 Thanked 3,162 Times in 2,188 Posts	You can use a fan from a ceiling exhaust, usually they fit 4" duct. They won't move as much air as a decent fan designed for horticultural use and they will be noisier and may be less reliable. Having said that, if there is no other air exchange from the grow space this type of fan could be useful. It's not too much more for a decent fan though, especially if you're planning to use a 600w light. Make sue you get one which isn't on a timer. __________________ Cultivate a stoic calmness *Fuck the Monkeys*