I've settled on two for now but still not sure if it's right?
Any advice would be much appreciated.
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Passive air intake flaps
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Growmie
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Passive air intake flaps
How many do I have open? At first I only had one open but the air only being drawn from there seems to be causing the closest plants to get windburn/curling. I tried to open them all but to even get some negative pressure I have to have the fan running really high. I don't mind but the fan is oversized for the tent so I'm struggling with balancing negative pressure/wind speed etc.
I've settled on two for now but still not sure if it's right?
Any advice would be much appreciated.
I've settled on two for now but still not sure if it's right?
Any advice would be much appreciated.
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2-Scoops
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Re: Passive air intake flaps
1 or 2 should be fine, i run a passive inlet myself in my grow cupboard. I've always gone by x1.5 to x2 times size passive inlet hole to your extraction fan, but i see your running oversized gear. But yes i would think 2 is more than enough in a smallish grow tent.
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E.p_grower
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Re: Passive air intake flaps
What size tent and what CFM is your fan?
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- Growmie (Wed Oct 06, 2021 10:38 pm)
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Growmie
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Growmie
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Re: Passive air intake flaps
Thanks mate, two open seems better than one at the moment as one on its own causes too much of a kind of wind vortex and was stressing the smaller plants. With two though it seems fairly stable. Thanks mate!2-Scoops wrote: ↑Wed Oct 06, 2021 1:16 pm1 or 2 should be fine, i run a passive inlet myself in my grow cupboard. I've always gone by x1.5 to x2 times size passive inlet hole to your extraction fan, but i see your running oversized gear. But yes i would think 2 is more than enough in a smallish grow tent.
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Anonymiss
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Re: Passive air intake flaps
Negative pressure isn't all it's cracked up to be - it makes no difference to the plants and is really just about making sure that the smell doesn't esacpe before passing through the fan and filter.
Perhaps consider a an auto transformer (Variac) to reduce fan speed and noise? I've had one for a while and wouldn't do without it now. (Don't get the "dimmer switch" type of controller unless you want a much noisier fan!)
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