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As has already been said... stick with the existing duct sizes... and when I was a HVAC installer here in SoCal around 20 years ago we did just about everything with 100% flex duct.
Edit, some duct board, some rectangular sheet metal on commercial, some spiral steel and some aluminum, some fiberglass pipe (FS), but I would say 80-90% home instillation was flex duct.
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Gary Fisher 29er
2019 Kia Stinger 2.0t gone 
1995 Miata Sold
1984 944 Sold
I am not lost for I know where I am, however where I am is lost. - Winnie the poo.
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