what return duct size be

tableclocks Posts: 432, Reputation: 2

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Jan 4, 2022, 09:05 PM

what return duct size be

i have 100,00 btu and 3 ton unit, i use 1 main trunk line, what should the size be? about, i now have 20 x8, i an confuzzed about what i see on line, looks like i need about 600 sq inches, is that right?thats about 30 x 20 rextnagle. i use 1 center return aera in the center of the house, thank you for you time,
richard

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