Answer / waris jamal

one ton of refrigeration = 12,000 BTU/hr.

When it comes to relating this to air quantities, the basic equation is:

Q (btu/hr) = 1.08 (constant for air at standard conditions)*density correction factor*cfm*delta T

400 cfm per ton is a manufacturers nominal standard, or rule of thumb. It should get you in the ballpark, but is not exact.

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