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OfflineSivarted
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Greenhouse air input/exhaust locations
    #25309743 - 07/05/18 01:58 PM (2 years, 9 months ago)

I asked this question in another thread about building sectional greenhouses, but feel like more targeted single questions might be more likely to get a response:

There are conflicting ideas about where to put humidified air in and where to exhaust.

I've read that humidified air should come in the bottom, because humid air rises.

I've also read that you should exhaust through the bottom, because spores fall, and you want to send as many as possible but the exhaust.

Obviously, these two ideas are at odds with each other, because doing both is pretty clearly a bad idea.  :smile:

My current thought is to input at the bottom and exhaust at the top, and be prepared to clean up big spore messes from the bottom.

Reasonable?


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OfflineMorePies
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Re: Greenhouse air input/exhaust locations [Re: Sivarted]
    #25309958 - 07/05/18 03:48 PM (2 years, 9 months ago)

The fresh air/humidity should enter up high. Ideally there is a little bit of air flow over each shelf as small grow tents build up c02 pockets readily. If you are agitating the air at all, spores will not settle to the floor and humid air will be moving all around, not rising. You will also be pumping in water droplets not just fog. Spores will come into contact with everything. Because the input is at the top, exhausting from the bottom half will help circulation.


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Re: Greenhouse air input/exhaust locations [Re: MorePies]
    #25310061 - 07/05/18 04:44 PM (2 years, 9 months ago)

That makes sense.  It just goes contrary to "humidify from the bottom because humid air rises" wisdom.  Which I suppose doesnt matter all that much as long as I have consistent airflow from both an input and an exhaust fan.

It means the exhaust is more likely to have spores going through it, but that's going to happen either way, so I need to be able to deal with it regardless.

It would be *slightly* more convenient to input from the bottom simply due to the planned setup, which is why I was leaning that way, but it's not a big deal either way.

Thanks much.  :smile:


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OfflineMorePies
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Re: Greenhouse air input/exhaust locations [Re: Sivarted]
    #25310212 - 07/05/18 05:50 PM (2 years, 9 months ago)

You can duct your humidity wherever if the most logical input is less than ideal.


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OfflineSivarted
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Re: Greenhouse air input/exhaust locations [Re: MorePies]
    #25310286 - 07/05/18 06:42 PM (2 years, 9 months ago)

Quote:

MorePies said:
You can duct your humidity wherever if the most logical input is less than ideal.




Yeah, exactly.  Which is why it wasnt a big deal either way.  :laugh:


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OfflineMorePies
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Re: Greenhouse air input/exhaust locations [Re: Sivarted]
    #25310461 - 07/05/18 08:47 PM (2 years, 9 months ago)

Quote:

Sivarted said:
Quote:

MorePies said:
You can duct your humidity wherever if the most logical input is less than ideal.




Yeah, exactly.  Which is why it wasnt a big deal either way.  :laugh:




True. It ending up at the top is the best.


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