Call Duck Air Cell

[emmallaub]

Does anyone know what days I should check my call ducks air cells?
Also, anyone have a diagram showing how large it should be the day of checking?

Any help would be appreciated!
Also, humidity recommendations would be very appreciated!

Thank you .

 

[emmallaub]

Please!
The eggs are coming soon so I need to be careful.

 

[chickens really]

@Ravynscroft