Use this Adobe PDF form for calculating allowable leakage (cfm) based on SMACNA Leakage Class. It also calculates duct surface area, measured system leakage rate and pass/fail criteria. Use this Adobe PDF on your cellphone, laptop or iPad along with your tester. Email results to yourself, customer or home office. All you need is Adobe Reader. Download this file first, then Open.

SMACNA Leakage Class:
Right-click HERE and then “save link as…”.   Choose a location.

Next open the file using Adobe Reader.

Enter your orifice plate data first.  It will stay there even after resetting the form.  Save the duct leakage test sheet for future reference or email it for review.