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Thank you for the info. Should the air change be around 3 - 5 times per minute in the grow space ? My calculation is 1.83ft x 1.9ft x 4.1ft = 14.2257 ft3 106cfm / 14.2257 = 7.45 So the air is changing 7.45 times per minute in the grow space. Little over the requirement, but there will be few...

What pot size is optimal for 150w hps ? If growing in soil. In grow space around 2x2x4.

So exactly how much cfm does it have to be more precise ? If we can be more specific. :hump:

Greeting's everyone! Soon i want a buy a new 150w hps grow equipment and I want to know how much CFM's do i need too cool down the bulb? My grow space is 56x58x125cm help me please. Im also going to use 30cm cooltube. Could 100 cfm extract fan work for this matter? Later perhaps I will...