Ventilation in coop is very important.

[Kando]

I really wanted to reply to the thread discussing the person unable to get her 70 day old chickens back into the coop at night.
Regardless of the outside temperature the formula for ventilation of the coop is 1cubic liter of air flow per pound of chicken per minute. It's not the easiest formula to convert to the size of windows and vent you must provide. So is we are interested we could attempt to convert it to real life situations as far as windows and vents needed.

 

[DobieLover]

I really wanted to reply to the thread discussing the person unable to get her 70 day old chickens back into the coop at night.
Regardless of the outside temperature the formula for ventilation of the coop is 1cubic liter of air flow per pound of chicken per minute. It's not the easiest formula to convert to the size of windows and vent you must provide. So is we are interested we could attempt to convert it to real life situations as far as windows and vents needed.

Instead of trying to do the math with all the complexities involved with angles, wind velocities and directions, exterior obstructions, etc. just put in as much protected ventilation as possible. Large roof overhangs allow you to keep your large windows open without the risk of rain infiltration.
Using the space between rafters paired with a ridge vent and gable vents is one of the easiest places to get lots of ventilation. Having a predator proof attached run so the pop door can be left open allows lots of fresh air to stream in through the pop door.

 

[3KillerBs]

As a newb who didn't really know anything other than that I live in the hot and steamy southeast and that heat bothers chickens more than cold does I used the simple "rule of thumb" that if I could put my head and shoulders into the coop during the hottest part of the day and it wasn't any hotter inside than outside then I had enough ventilation.

I highly recommend a monitor roof to anyone who lives in a hot climate. It provides maximum, draft-free ventilation.

Since I couldn't leave the pop door open in the current situation we added an additional window when doing repairs before setting the coop up on the new property.

Coop thread here has construction detail photos.

With plenty of roof overhang it's dry as a bone even in sideways-raining thunderstorms.

 

[aart]

Regardless of the outside temperature the formula for ventilation of the coop is 1cubic liter of air flow per pound of chicken per minute

Where dis you get that formula?
An easier one is 1sqft of vent for each bird.
But @DobieLover's got it right, put as much ventilation as possible.

So is we are interested we could attempt to convert it to real life situations as far as windows and vents needed.

Knowing what your coop looks like(dimensions and pics)
and how many birds you have would help us give yo more specific advice.

Also....Welcome to BYC! @Kando
Where in this world are you located?
Climate, and time of year, is almost always a factor.
Please add your general geographical location to your profile.
It's easy to do, and then it's always there!

 

[rosemarythyme]

Where dis you get that formula?
An easier one is 1sqft of vent for each bird

That's how I recommend calculating as well. And yes I went and measured my windows and vents (doors don't count unless they stay open regardless of weather) and did some rough math to come up with my total. Was hoping for 3 sq ft per bird but I'm just shy of that right now.

 

[RainbowHen]

As a newb who didn't really know anything other than that I live in the hot and steamy southeast and that heat bothers chickens more than cold does I used the simple "rule of thumb" that if I could put my head and shoulders into the coop during the hottest part of the day and it wasn't any hotter inside than outside then I had enough ventilation.

I highly recommend a monitor roof to anyone who lives in a hot climate. It provides maximum, draft-free ventilation.

View attachment 2261209

Since I couldn't leave the pop door open in the current situation we added an additional window when doing repairs before setting the coop up on the new property.

View attachment 2261210

View attachment 2261212

Coop thread here has construction detail photos.

With plenty of roof overhang it's dry as a bone even in sideways-raining thunderstorms.

Love this design!

 

[aart]

An easier one is 1sqft of vent for each bird.

That's how I recommend calculating as well.

Even that is a rough 'rule of thumb'.
Much can depend on the configuration of the coop.

 

[3KillerBs]

Love this design!

Thank you. I saw the concept somewhere on this site and DH made it happen for me.