This new system is a calibrated air flow measurement system used to test and document the air tightness of forced air duct systems in both houses and light commercial buildings.  The Duct Blaster fan is directly connected to the duct system, typically at a central return, or at the air   handler cabinet; With the remaining registers and grills temporarily taped off, duct air tightness is measured by either pressurizing or depressurizing the duct system and precisely measuring the fan flow and duct pressure.

 Duct air tightness measurements are used to  diagnose and demonstrate leakage problems, estimate efficiency losses from duct leakage, and certify the quality of duct system              installation.