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pothead22

Negative pressure

Hoping someone could give me a heads up please...basically Ive been using my 8" rhino LOW power fan with a variac for my extraction. I'm wanting to run an intake with the variac too however the only fan I have to hand is a 6" HIGH power one and was a bit worried it wouldnt keep negative pressure? Cause surely the carbon filter will restrict the flow of my extraction quite a bit..or would it probs be more benefical to get another intake? Any help appreciated. Thanks.

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your correct in your thinking, if your in a tent you can normaly see the walls pulling in, tightening  up, you might be ok or if the tent bulges then your not, passive air intake ? 

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Sounds like you are going to have the correct negative pressure to me.. 6" in and 8" out.. So stronger going out than coming in = negative pressure :)

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You should be able to work it out using your fan specs.  Subtract around 25% efficiency for you carbon filter and try to keep bends in the ducting to a minimum.

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Thanks for the replies I did end up trying it however and the walls did suck in on the tent pretty well.. for some reason my 6 inch fan is way louder than my 8 inch so consdering going using my 8 inch as an intake and a 10 inch extract, may be overkill but im hoping it will sort the noise. Thanks again.

 

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If using aluminium flexi stretch it taught, reduce friction against the jagged inner walls, quieter and more flow.

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