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Originally Posted by smoke and coke
thanks for the link, but he states this in there about ventilation and i disagree with his figures on size fan. isnt that fan too small
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I am not sure what to tell other than to look at his op...
The man gets a pound every two weeks from 2x 1k HPS...
I follow his teachings and get the same thing with 4x 600HPS... and I am a 6 month newb...
I believe he has more than proven himself to this community... but you do not have to believe him...
I say look at his op...
Get a harvest every 2 weeks
Quote:
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The space needs to have enough airflow to both remove heat from the lighting, moisture in the air put there by the plants and provide adequate CO2 for the plants. This means a ventilation system that will exchange the entire volume of the room air in about 3-5 mins max. Work out your room volume by multiplying room length x width x height and then go shopping for exhaust fans based on that figure. A 1000 cubic foot room needs a 200 CFM (cubic foot/min) exhaust fan. If you can't ventilate the space, you can't grow in it.
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Here is a very simple illustration, courtesy of Al B. Fuct... it portrays his recommendation for setting up ventilation...
As I said before... I follow his word and have the same results as he does...