I'm putting the final touches on a complete new duct system and wanted to get some opinions. The system is a basement located reducing trunk style and everything is properly sized with a fairly consistent velocity per Manual D. The design basically puts most of the register takeoffs directly above the trunk, which is either in the joist cavity or just below the joists. In other words, the branches will be short taps into the top of the trunk. Aside from using the lowest friction taps, is there anything else I should know concerning flow pattern or noise? Would it make sense to keep the velocity at the low end, say 500 FPM? Obviously, a least amount of fittings is good, but such a direct path to the handler makes me wonder about noise. This is being pushed by a Ruud Mod, BTW, so it won't have the SS blast. Thanks