What is a Duct Blaster?
A Duct Blower or Duct Blaster is a device that is similar to a blower door and is an accurate tool for measuring the tightness of the ducts. The duct blaster is used to pressurize the duct system when all the registers are blocked. Measuring the air flowing through the duct blower’s fan housing gives an accurate measurement of duct leakage. By pressurizing the house and the ducts at the same time, we can measure the amount of conditioned air that is leaking outdoors. This test provides measurements of duct leakage in cubic feet per minute (cfm). They estimate neither the actual leakage from the ducts when the system is operating, nor the leakage across the leakage sites when all sites are at the same pressure. The purpose of a production quantitative measurement is to obtain quality work that will reliably impact energy use.
