Iron Gym home pull up bar?

I'd like a home pull up bar but don't know anybody that actually has one, so I thought I'd ask for reviews on here. I've read reviews online (at sites like amazon and walmart), and the Iron Gym has gotten mostly positive feedback. My question is, what size should my doorframe be to fit it? A lot of... show more I'd like a home pull up bar but don't know anybody that actually has one, so I thought I'd ask for reviews on here. I've read reviews online (at sites like amazon and walmart), and the Iron Gym has gotten mostly positive feedback. My question is, what size should my doorframe be to fit it? A lot of the reviews say "be sure you measure first," but they don't say what the measurements need to be to fit it so that doesn't do me a whole lot of good :p Or if anybody's had a positive experience with an adjustable bar (I don't have a brand in mind but I know some are out there) and would be willing to share, do let me know! Thanks in advance for any reviews and suggestions.
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