My goodness, they even used fake chickens in the picture. I hate that getting a good setup going is being so difficult for you. Now that chicken keeping has become trendy it just gets more and more convoluted.
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I agree, I actually have one of those store bought coops and they are too small, I now use it for my little ones when I want to introduce them to the big ones. It's big enough for my three chickens that are two months old.I've seen some cool kids playhouse remodels that could come together in a day and give a couple chickens a nice set up for a similar cost. Cute too.
I know it seems like a pain to have to ship it back but it will pale in comparison to the headaches caused by having an inadequate coop that's too small, not well designed, not well made and not user friendly.I think that's what I'll do. I'll just get two bantams and cut more ventilation. I HAVE done many searches on this site. The return shipping would cost too much. I goofed up big-time when I didn't take the nest box into consideration when considering sq. ft. I was measuring 4x4, which is 16. Just not thinking. How wide should the ventilation holes be, and how many?
I think that's what I'll do. I'll just get two bantams and cut more ventilation. I HAVE done many searches on this site. The return shipping would cost too much. I goofed up big-time when I didn't take the nest box into consideration when considering sq. ft. I was measuring 4x4, which is 16. Just not thinking. How wide should the ventilation holes be, and how many?

According to the manufacturer it's this:According to Amazon, it’s got 12’ of interior space which probably includes the nest box area.
According to the manufacturer it's this:
Interior L (in) 34.1, W (in) 21.7, H (in) 25.2
http://www.newagepet.com/product/ecoflex-fontana-chicken-barn/
which makes 5.13 sq ft of interior square footage. There's no way adding next box area gives it another 6 plus square feet.
Amazon information is often listed by one of their many resellers. It's all over the place. I'm inclined to trust the dimensions provided by the manufacturer, though not their estimate on how many birds it fits.

That’s what you say now, but chickens are addicting.I think that's what I'll do. I'll just get two bantams and cut more ventilation.
Definitely false advertising.Or, again if I was you, I'd complain to Wayfair loudly that advertising that coop as fitting 4 chickens, bantam or LF, is blatant false advertising and animal cruelty and they ought to pay for all shipping costs, else you'll take to social media.