OK, Can't rebuild, what are my options (Realistic Please)

[Buckeye2002]

That should work on the gables...even tho it's a soffit vent.

Would this work better?
https://www.homedepot.com/p/Master-...PIPHorizontal3_rr-_-100038053-_-100065701-_-N

 

[HenOnAJuneBug]

Would this work better?
https://www.homedepot.com/p/Master-...PIPHorizontal3_rr-_-100038053-_-100065701-_-N

Size is better, but kind of pricey. Do you live near a ReStore? Sometimes they have gable vents.

Update: Sorry I didn't click on your link. Those are too small. I was looking at 18"-24" vents at HD.

 

[Buckeye2002]

Size is better, but kind of pricey. Do you live near a ReStore? Sometimes they have gable vents.

Update: Sorry I didn't click on your link. Those are too small. I was looking at 18"-24" vents at HD.

We do...great idea...

 

[HenOnAJuneBug]

We do...great idea...

I'd get as large a vent that you can that will fit in your gable area.

 

[CanadaEh]

Yes, understood...but wonders with one end was open on a 3x13 'pipe' would the fresh air even reach the far end? That's why the proportions are important for an 'open air' coop.

yes - as water pours out of horizontal pipe closed on one end, the hot/moist air will be escaping out and cold/dry air coming in at a constant rate *regardless* the wind pressure and direction

 

[aart]

yes - as water pours out of horizontal pipe closed on one end, the hot/moist air will be escaping out and cold/dry air coming in at a constant rate *regardless* the wind pressure and direction

Although air is 'fluid' it's not the same as water like you describe.
Woods concept is that the coop is closed, except for open front, so wind can't blow thru, this air cushion(pressure) only allows fresh air in so far and slows then stops it's movement.
The 8 wide x 16 deep(std Woods) works, but I believe the air movement thru the 3' opening would stall way before it reached the other end of the 13' length.

 

[HenOnAJuneBug]

The thing to remember about water vapor is that it will rise to the top of the coop because it is lighter than air. Provide a way for it to escape and it will.

 

[EggWalrus]

Would this work better?
https://www.homedepot.com/p/Master-...PIPHorizontal3_rr-_-100038053-_-100065701-_-N

Wouldn't work at all, too small.
Here is a link to a gable vent that has 1 Sq ft of ventilation.
If you put one on each end, the 2 Sq Ft should suffice.
The other small vent cover you uploaded will work great down close to the floor. Regardless of what some have said on here about not putting in lower vent because they create a wind tunnel effect, that is not true. If you had a 25 mph wind outside, when it hits the floor vent, the wind speed drops to less than 2 or 3 mph. And once a foot away from vent inside it drops to less than 1mph because of the large size of the coop in comparison to the vent size.
It's like how you can increase water speed coming out of a water hose by putting your thumb over it, choking/reducing the size of the exit. Whether pneumatic (air) or hydraulic (fluids) the same applies even in reverse. When air leave a place of high speed/pressure like outside and enters the coop, the air slows down, it does not speed up or even stay the same.
Think of being in a house with the windows up in a 25 mph wind. You will feel some breeze in the house but not 25 mph. If you are right at the window is blowing in from, it might blow a few mph, but step a few feel away and till barely feel it but it is moving. When you get right up on the exit window you may feel it again.

 

[CanadaEh]

Although air is 'fluid' it's not the same as water like you describe.
Woods concept is that the coop is closed, except for open front, so wind can't blow thru, this air cushion(pressure) only allows fresh air in so far and slows then stops it's movement.
The 8 wide x 16 deep(std Woods) works, but I believe the air movement thru the 3' opening would stall way before it reached the other end of the 13' length.

the cold air spills down and can get trapped in low areas like liquid, the hot air escapes up and can get trapped in e.g. cathedral ceilings.

It could be with 23 chickens stuffed at the far end this natural air exchange with outside through the far open wall will not be able to remove the generated moisture fast enough, but i bet it will still be more efficient in a calm weather than 2 small louvered vents the OP is planning to put on opposite walls.

 

[aart]

Here is a link to a gable vent that has 1 Sq ft of ventilation.

Not seeing link?