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OfflineSatori23
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New Oyster Greenhouse
    #18227468 - 05/07/13 02:11 PM (10 years, 9 months ago)

I am starting a new walk in greenhouse for oyster logs. I wanted to run the specs by you all & see if you have any advice or criticism. Especially before I invest & then keep this thread as a log of progress.

I will have an estimated 18 straw logs. With 9 on each side of the greenhouse laying horizontal on racks - I will not be hanging them.

The green house measures 7' long, 4.5' wide & 6.5' high. Total volume of around 204 cubic feet.

For fresh air I plan on having a 8" duct fan rated at 250 CFM for intake, this will be installed near the top of the greenhouse. I will then have either a 4" duct fan rated at 80 CFM or a 6" duct fan rated at 160 CFM for the exhaust. It will be installed at the bottom of the greenhouse moving the CO2 at the bottom out. What CFM rating do you guys think I should use for the exhaust?

As for now I had simply planned on having ultrasonic humidifier(s) inside the greenhouse to maintain humidity - going to have to try & dial it in. IF that doesn't work out efficiently I will build a bulk humidifier & run the humid air through the intake.

I would greatly appreciate any & all feedback I can get on this proposed build. My main concern is the fresh air & humidity control. I want to make sure I am pushing enough fresh air in while moving the CO2 out through the exhaust fan & at the same time maintaining the humidity. Thanks everyone!

:bobmarley: :discorex:  :whatdoyouthink:


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Offlinedrake89
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Re: New Oyster Greenhouse [Re: Satori23]
    #18227598 - 05/07/13 02:37 PM (10 years, 9 months ago)

I would post pics of my similar setup but I'm on my phone.  Kinda ghetto rigged but whatever.  8*8*4 so I could use standard construction materials, I don't have any power tools sides a drill.  Issues: keeping humidity and fresh air in balance is key.  I had trouble with both at first, temps too, cause running the humidifiers inside it during the day it got up to 99F!  Solution: move them outside into separate 35gal plastic tub that's connected via a 4" duct.  Even better solution: 5 head pond fogger from mainlandmart in the same tub with water in it keeps fog VERY thick inside.  Btw I sealed a 4" muffin fan in the side of the tub to push the fog into grow space, doubles as fresh air.  Runs off cheapo timer 30 minutes per hour.  Plastic space heater keeps it 70-75.  Very happy so far.  Logs on 2nd flush.  Will post pics l8r


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OfflineSatori23
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Re: New Oyster Greenhouse [Re: drake89]
    #18227607 - 05/07/13 02:39 PM (10 years, 9 months ago)

Thanks Drake! I look forward to the pictures!


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OfflineSatori23
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Re: New Oyster Greenhouse [Re: Satori23]
    #18228321 - 05/07/13 04:54 PM (10 years, 9 months ago)

Here is an idea of what I am talking about with the duct fan placement.




The intake fan would be at the top pushing in the air from outside the greenhouse at a higher CFM than the exhaust fan on the lower part of the green house blowing out the CO2 that falls to the ground.


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OfflineSatori23
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Re: New Oyster Greenhouse [Re: Satori23]
    #18231441 - 05/08/13 07:11 AM (10 years, 9 months ago)

Is this the appropriate kind of placement for the intake & out take? And the appropriate CFM ratings if trying to create a positive pressure environment?


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OfflineAmanita virosa
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Re: New Oyster Greenhouse [Re: Satori23]
    #18234194 - 05/08/13 06:44 PM (10 years, 9 months ago)

Forget the exhaust fan. You just need to suck air in. You cannot maintain proper humidity inside the grow space if you are constantly venting all the humid air out. The air you are sucking in will find a way out of the greenhouse without a vent or exhaust fan


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OfflineWhiskyTangoFoxtrot
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Re: New Oyster Greenhouse [Re: Amanita virosa]
    #18265451 - 05/14/13 07:48 PM (10 years, 9 months ago)

Not only that, but why would you filter your exhaust instead of your intake?


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OfflineSatori23
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Re: New Oyster Greenhouse [Re: WhiskyTangoFoxtrot]
    #18272998 - 05/16/13 07:57 AM (10 years, 9 months ago)

There isn't much reason to filter the intake to your greenhouse. The colonized substrate can fend off most contams that come its way before the substrate is spent. By filtering the exhaust you are preventing spores from being thrown all over your house; especially with oysters.


I have although gone another route with this. Will be using an intake but a passive air flow for exhaust. Will update shortly with progress pictures.


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Edited by Satori23 (05/16/13 07:58 AM)


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OfflineJeff
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Re: New Oyster Greenhouse [Re: Satori23]
    #18275832 - 05/16/13 08:32 PM (10 years, 9 months ago)

Quote:

Satori23 said:
There isn't much reason to filter the intake to your greenhouse. The colonized substrate can fend off most contams that come its way before the substrate is spent. By filtering the exhaust you are preventing spores from being thrown all over your house; especially with oysters.





When I read the OP I assumed it would be outside.  If it was me I would still filter the exhaust now that I know it is indoors.  Oyster spores are a major pain in the ass in your living space especially if your "lab" area is in the same house.  There are respiratory health risks associated with oyster spores that also that can't be discounted.


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Myco-tek


Edited by Jeff (05/16/13 08:33 PM)


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