I am starting my second grow right now. I think I have a pretty good handle on nutrients and lighting, but I don't feel very confident about the ventilation. I am going to use the "barrel of green" setup I am going to use a 150w HPS in a small space. Do I have to have a squirrel cage blower or can I get by with a couple of computer fans. I have it set up so I don't have any long stretches of ducting, maybe 4 feet total.
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