1.7 sq ft of free ventilation from those, plus your oeneings at either end.
...and somewhere along the way, my blood got thin. Its 60 here, 98% humid (maybe higher), with winds at 10, gusts twice that+, I had to put a long sleeve shirt on. The chickens don't seem to recognize me in it.
Keep...
The best thing you can do is start with good, fresh, high quality feed. and stop giving them poultry booster.
Why? Read the label. Poultry booster was formulated as a general purpose "catch all" intended for adult laying hens. Its like the Dr saying "take two aspirin and call me int he...