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#106184 - 10/19/12 07:17 AM air exchange
jonnydot Offline
Flock Leader

Registered: 12/05/11
Posts: 298
Loc: australia
I'm looking for a formular to determine air ventilation and exhaust requirements in home made incubators ????

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#106261 - 10/21/12 10:22 AM Re: air exchange [Re: jonnydot]
Smooth Mule Offline
Coop Keeper

Registered: 02/13/10
Posts: 637
Loc: Missouri
I can't help here other than I made my own and had to experiment just a little and it works fine now.
How would you measure it? My incubator was made using a non-working wine cooler, the size of a dorm fridge. When the compressor was removed and all the tubing from the back, it left a 1 inch hole at the top. There was no freezer compartment at the top like a refrigerator. I put an inch sized hole near the bottom and that has worked fine. There is a small fan in the bottom at this time, near the heat source and water.

I don't know if you could develop calculations from that, hope it helps

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#106269 - 10/21/12 09:10 PM Re: air exchange [Re: Smooth Mule]
Uno Offline
Lord of the Fowl

Registered: 08/26/05
Posts: 1280
Loc: Canada
I have built a few homebuilt incubators and never worried about ventilation or exhaust. I open them everyday to turn the eggs and candle so that acts as ventilation and exhaust. I think an incubator that is too airtight is not good. Have you ever met an air tight chicken? No.

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#106560 - 11/02/12 03:53 AM Re: air exchange [Re: Uno]
jonnydot Offline
Flock Leader

Registered: 12/05/11
Posts: 298
Loc: australia
Found this ....http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CC0QFjAA&url=http%3A%2F%2Fmedallaquailfarm.multiply.com%2Fjournal%2Fitem%2F13%2FAir-Requirements-During-Incubation&ei=hX-TUMCBE4fBiQfQ2oGgBA&usg=AFQjCNHYzkd6e26f52qQTaDmXGNdTp_vVg&sig2=Yb3eFVbhHuHLLgjAR2w40w.... so based on these figures I would need to have an air transfer every 3 hours ,so all I need to do is calculate the internal cubic measurements of the bator....work out to cfm rating of the fan ,and that will tell me how much air is moved and work out how big to make my intake and exhausts from there

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#106711 - 11/14/12 08:31 AM Re: air exchange [Re: jonnydot]
Smooth Mule Offline
Coop Keeper

Registered: 02/13/10
Posts: 637
Loc: Missouri
I've found that information too, just found it easier to just experiment. It was pretty easy to get it right. Also remember that there should be holes at top and bottom for the correct flow.

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#106782 - 11/15/12 04:13 PM Re: air exchange [Re: Smooth Mule]
jonnydot Offline
Flock Leader

Registered: 12/05/11
Posts: 298
Loc: australia
Smooth Mule I agree ,I already have 2 I have made ,I was trying to make my new one to more exacting standarts (300 eggs) but in the end as long as the pid can compenstate and without over working ,I gues it really doesn't matter,the last one I built has 6 x 10mm holes down low and 6 x 10mm holes in the top and it is on for 1 minute and off for 5 minutes and it holds temps very well

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