Ceiling is too high for rings

Hey guys, trying to hang a few sets of rings from a 15ft ceiling and the standard straps are good enough for muscle ups, but we were hoping to have them available for general usage (dips, etc) as well.

The folks at Lowe's say that they don't feel comfortable giving us chain for that purpose - is there a specific chain we should use for this task? Another material? Preferably not simply ordering more GB straps, since we'd like to get these up ASAP.

Thanks all!

If you go to a climbing shop you should be able to get some nylon loops (open sling) that will do the job. They come in various lengths, i think you should be able to find one that will be long enough, though getting them down to floor level might be an issue.