So your coop, the inside area, is 40" x 20". 5.5sqft for the coop, the run is 70"x20" which is 9.7sqft.
A common rule of thumb for a standard sized bird is 4sqft per bird in the coop. 10sqft in the run. Minimum. So you can see where I'm going with this on how many birds you can keep in there...
Coops often calculate their "maximum bird capacity" based on LEGAL requirements, which are the legal minimum for CAFO farms, usually 1.5sqft per bird. These are the sizes used in huge battery farms where the birds live at most 18 months before becoming campbells chicken noodle soup. You can't REALLY keep chickens that way. Not if you want healthy, happy animals.
A common rule of thumb for a standard sized bird is 4sqft per bird in the coop. 10sqft in the run. Minimum. So you can see where I'm going with this on how many birds you can keep in there...
Coops often calculate their "maximum bird capacity" based on LEGAL requirements, which are the legal minimum for CAFO farms, usually 1.5sqft per bird. These are the sizes used in huge battery farms where the birds live at most 18 months before becoming campbells chicken noodle soup. You can't REALLY keep chickens that way. Not if you want healthy, happy animals.