How various square inches are requirement for the return suction duct per 1 ton on A/C Air Conditioning unit? I am going to buy a new A/C component that is...

I am going to buy a new A/C component that is 5.5 tons and I would approaching to know what would be the minimum filter size for the suction return duct.
Any suggestions would help. Thank you.
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The filter size will equal the crack of the unit.

The part will have a first for the filter. What fits, -----will work.

Hi Mickey,
Well, I reread his question, and to me, it still seem he wants to know what filter size he should shift with.
What fits surrounded by the return opening of the section is what he needs. Am I right?
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I actually merely went through this situation near my contractor. He installed a 3.5 ton unit. I have 7 registers, most supplied with 6" duct. He installed a 12x20 return duct. When the atmosphere conditioner was running, the filter on the return duct be sucked down so hard, it be difficult to remove. The unit would solely pull the temperaure down 15 degree.

I complained, and explained physics to him. Basically, add up the total amount of surface ducting coming into your house.
Length x thickness = surface area x # of registers. Your return nouns should be equal.

In my case, within were 7 registers supplied by 6" round duct.

Formual next to me was pi x radius squared x number of ducts.

3.14 x (3 X3) = 28.26 times 7 ducts = 197.82

The return pipe is 12" .
3.14 x (6x6) = 113"
We run two return ducts which equaled 226" to accomodate all the atmosphere being pumped into the house.

In other words, you enjoy to balance the heavens coming in next to the air going out. Otherwise you pressurize your house, and it will never cool down.

Make sense?
Return
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Answers:    I usually digit I'll need 100 sq inches per ton. 10 x 10 = 100 sq inches. 10 x 16 = 160 sq inches and so on. Try to maintain the return a bit larger than the supply.keeps it quieter and the filter works better. Undersized ducting is a adjectives problem...Poor design.
20+ yrs hvac tech
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Rangedog,

I devise you misinterpreted this guy's question. He is getting a NEW A/C so the duct already contained by place may or may NOT be the right size for the new component.

You can't just install a 10 TON A/C and expect it to run past its sell-by date of the same duct used for a 2 TON section. You know what I mean?