Apples to Apples maybe?.... That is your apples to applies comparison.....
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Ventilation Space: Standards don't say, except "it needs to be adequate". One book I have doesn't give a set number, only that it needs to be adequate to maintain levels of Ammonia, C02, dust particulates, etc, below levels measured in PPM. I don't have a ruler that allows me to measure that, so that is no help to me at all. Rule of thumb is 1 SF of vent space per 10 SF of floor area.
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Speaking of insulation, one book suggests a chickens comb will begin to freeze at +6F. Most likely it was referencing long combed birds like leghorns and roosters, but if you live in USDA climate zone 6a or lower (colder), consider adding insulation to your building. It is not for heat as you think it is. Each bird we have is a little mini furnace radiating several btu's of heat. In a cold climate, a coop can be kept warmer and dryer if the heat generated by the birds is trapped within by insulated walls and ceiling. As much as 10 to 20 degrees warmer depending on a lot of factors, including the number of birds and space they are housed in. Bottom line is if the building is done right, supplemental heat in any form is hardly ever needed, even in climates where outside temps fall to -20 or more.
Insulation..."trapped" heat statement conflicts with 'rule of thumb' ventilation cited....one of the hardest aspects for most folks to understand.
..and some folks DO have to start with coop size then bird numbers due to the area they have available.
This is still my favorite Space treatise for backyarders https://www.backyardchickens.com/a/how-much-room-do-chickens-need
Tho your info on the industry standard definitions for labeling is something backyard egg sellers definitely need to be aware of to inform their customers.
But lots of good info there Howard!
ETA: the title "chicken math made easy" is rather misleading(like most headlines-haha) Most important thing about making chicken math easier is to include Subtraction!
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