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Depending on your intentions an I beam is the better choice if your using a trolley for a chain hoist. You can use an H but most trolleys at least the ones I am familiar with have angled wheels made to ride to taper of an I beam vice an H.
I installed an 24 foot run for a hoist about 6 years ago using an H instead of an I, it works but I rather the I but I had H at the time.
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