Grill Mask, the specialty blue “vent tape” is a great asset with many uses. Due to its tackiness, thickness, easy sizing and color it is perfect for many duct cleaning and IAQ applications. Duct cleaners use it to block off vents during the cleaning procedure. Duct sealing contractors use it to seal registers while doing pressurized duct sealing and diagnostics such asAeroseal. Indoor air quality and energy management consultants use it during leakage and blower door testing. Installers use it to temporaily block contaminants from getting into new ducting during construction. Some folks even use it as a temporary floor covering on stairs and new carpeting. How will you use it?