How much CFM do I need for 6 400w hps systmes ????

**aug181983** · 07-10-2010, 10:59 PM

I need to know how much CFM I need to exhaust my 6 400w hps systems.

Also who has the best prices on these. Please take 10sec and look at this ..

will this work ?

http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT

Thank You

**rocpilefsj** · 07-10-2010, 11:31 PM

Here try this calculator out... It is more for size of your room. Hope it helps

http://cheaphydroponics.com/Merchant2/cfmcalc.htm

**aug181983** · 07-10-2010, 11:38 PM

THANKS ALOT BUDDY , That really helped . Its says I need a 210CFM to exchange air completely every 5 mins but I got a good deal on a 424cfm so that means Ill be exchanging air every 2min and 30secs , that should help with keeping that hot air out the room/reflector

**rocpilefsj** · 07-10-2010, 11:46 PM

Good luck! Should be a nice harvest with all those lights.

**skiweeds** · 07-10-2010, 11:49 PM

i got the same exhaust fan except it's 4'' from htg supply. works excellent. you can also get hoods with glass under them and the exhaust hooks right up to one side and sucks out most of the hot air before it even gets inside the room/tent. the hood i got is called the euro reflector http://www.htgsupply.com/viewproduct...roductID=49541