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I hope you get some replies with photo references, since I'm in the middle of exactly the same project. I suspect the fans installed on the F7s were smaller in diameter than 36", as the dynamic brake hatch where they were installed was only about 6'6'' in length. I'm guessing the fan housings were in the range of 24" to 30" in diameter to be able to fit (unless CNW enlarged the hatch when the units were converted from freight to passenger service when dynamic brakes were removed--and from side-view photos of converted F7s, it doesn't loook to me as if they were lengthened). The horizontal covering over these fans also appears to me to be plain ol' sheet metal, rather than screening. A rain and snow shield perhaps? Finally as to F7s, it appears to me from the pretty poor overhead shots I've seen, the rearmost hatch was widened when HEP equipment was installed, so that the rearmost hatch is as wide as the hatches over the prime mover.
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