Are there fittings that are more efficient when making the transition from the branch duct to the floor register? I saw a web article that referred to this but there was not much detail. Talked about a 3 seam elbow versus a 90 degree mitered connection. Seemed that some fittings are quite inefficient. Is flex duct a bad idea to use as a boot? Are there fittings that leak less? I am having the ducts redone and want to be able to suggest to my contractor the most efficient fitting.
Does anybody have any experience with tapered fittings to start a branch run?
[Edited by heetseeker on 06-04-2005 at 03:58 PM]