In my cabinet install we decided to re-route a registar from the living room that had 3 others sorces into toe space of opposite wall kitchen cabinets. We blocked the vent to living room basicly routing to opening on opposite side at toekick level. This forcing air to the desired side. Proper ducting was used but a 90 elbow was required under the corner cabinet using a reduced in cubic inch opening. Should this decrease the flow? With liquid it would / can increase pressure. Sould the same theory apply? Any HVAC guys out there?
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I've done a couple different methods to accomplish the same thing.
using snap together rect. duct. cut in a hole in the bottom to fit the round supply and use the same size round "boot" to connect to the "box".
get the round to rect. transition to come up thru the floor, then attach to the same snap together rect. duct. The sq inches of the transition are same as the round pipe.
you can only fit the narrow 2-1/2" or so rect. to fit in that toe space. Cut it in on the high side of the toe so final flooring doesn't interfere with the reg. grill.
Of course it affected the pressure and flow. Anything one does to the ducting, adding elbows, transitions, etc will decrease flow. Does it matter to your system? Who knows? I'd wait till winter and see if your toes stay warm. If they don't, then maybe do something about it.