Aeroseal Duct Sealing is a patented breakthrough technology that tackles air duct leaks from the inside out. Reducing leakage by up to 90% or more. Aeroseal software allows the technician to accurately measure the duct leakage in residential homes and commercial buildings. The Aeroseal process puts escaping air under pressure and causes polymer particles to stick first to the edges of a leak, then to each other until leaks up to 5/8" wide are closed. Saving you money, improving indoor air quality and improving comfort.