Use this Adobe PDF form for calculating allowable leakage (cfm) based on SMACNA Leakage Class. It calculates duct surface area, measured system leakage rate and pass/fail criteria.
Click HERE Save/download the file.
Open using Adobe Reader.
Enter your orifice plate data using your calibration certificates.
Email the file for review and save a copy for future jobs.
Make sure you have the Adobe Reader App on your device!