It’s very standard. I feel like it was a 14 x 24 or something around there. He will send you several PDFs and detailed instructions/videos about the install. I have a Dodge Pro master and it fit exactly in the roof cut out behind the driver cab area. I’m out and about but I can send more information tomorrow. The owner is very nice and easy to talk to. If you’re OK with all white model He had some 2021 models that he sold for $1850. The 2022 models were about $600 more. Still about half the price of a Nomadic cooling unit that looks identical to design and BTU rating. I installed one in my van and I’ve run it several times it works good. Currently the highest wattage usage is at 650 And drawings little over 50 A.