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There are 400 cfm in 1 ton
Take the number of cubic feet and divide that by the number of minutes. cfm=cf/m
Air return duct and filter grille size is dictated by the size of the unit (CFM) not the size of the house.
Well, darling, CFM stands for cubic feet per minute, while CMH stands for cubic meters per hour. So, the relationship between the two is that 1 CFM is equal to approximately 1.699 CMH. It's like comparing apples to oranges, but hey, they both measure the flow of air, just in different units.
your going to get 800 cfm through a 20x20. Its the gross square inches divided by 2