Free Online Calculator Tools

Running  a duct leakage or duct pressurization test? Save time by using these online calculators and downloadable form !

Duct Leakage Test Forms –  Two downloadable, Adobe PDF based forms (SMACNA and DW/143) that calculate duct surface area, allowable leakage, leakage factor. Use the appropriate form along with your Oriflow tester to calculate leakage and make density corrections. Just input your orifice plate data in the table at the bottom of the form.  Use only the form for your particular needs. The DW/143 form is not used in the U.S.

Calculate Allowable Leakage – SMACNA Leakage Class  –  Use this online calculator to determine allowable leakage given the duct surface area, test pressure and SMACNA Leakage Class specified for the job.

Calculate Allowable Leakage – DW/143 Pressure Class –  Use this online calculator to determine allowable leakage given the duct surface area, test pressure and DW/143 Pressure Class specified for the job.

Calculate Allowable Leakage – % Allowable  –  Use this online calculator to determine allowable leakage (cfm) given the system flow rate (cfm) and percent (%) allowable specified for the job.

Calculate the Correct Tester/Plate Combination  –  Use this online calculator to determine the recommended duct leakage tester (Cobra or Lynx) given the allowable leakage and test pressure for the job.