Duct Leakage Testing

In any new home built in Minnesota all duct systems with any portion located outside of the building envelope will need to have a duct tightness test or duct blasting done. 
      This test can be done in two ways: One is a rough in test, if air handler is not installed total leakage shall not be greater than 3 cfm per sq. ft. of conditioned floor area.  The second way is a test on final, total leakage shall be less than  or equal to 4 cfm per 100 sq. ft. of conditioned floor area.
 Pricing: staring at $200