Enter the total attic floor space (ft^2) into the Calculator. The calculator will evaluate the Net Free Air. 

Net Free Air Formula

NFA = FP/150

Variables:

  • NFA is the Net Free Air (ft^2)
  • FP is the total attic floor space (ft^2)

To calculate Net Free Air, divide the total attic floor space in square feet by 150.

How to Calculate Net Free Air?

The following steps outline how to calculate the Net Free Air.

  1. First, determine the total attic floor space (ft^2). 
  2. Next, gather the formula from above = NFA = FP/150.
  3. Finally, calculate the Net Free Air.
  4. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total attic floor space (ft^2) = 600