A new technology, called aeroseal, developed at Lawrence Berkeley National Laboratory with funding from the EPA and the US Department of Energy among others, provides a new way to seal leaky air ducts. JMD Corporation recently purchased the exclusive rights to the duct sealing technology and formed Aeroseal, a company that will sell the duct sealing technology to US homeowners and businesses.
Aeroseal works by sealing duct leaks from the inside of the duct system. Applied as an aerosol mist, the non-toxic spray travels throughout the interior of the ductwork attaching itself to the edge of the leaks, then bonding to other sealant particles until the hole is sealed. According to Lawrence Berkeley National Laboratory studies, the process is 95 percent effective at sealing air duct leaks.
Unlike traditional duct sealing methods such as tape or mastic, aeroseal makes it possible to seal all the leaks, including those hidden behind walls, under insulation or other hard to find and access locations.
According to Aeroseal’s FAQ page, energy savings are different for light commercial vs. large commercial buildings and depend upon the initial duct leakage level. The Aeroseal Energy Savings Excel spreadsheet can be used to estimate the savings for both types of buildings. For ducts above an insulated ceiling in a light commercial building, energy savings should be 10-30 percent of HVAC energy use, and peak electricity-demand reduction is generally a higher percentage. In a large commercial office building with a VAV system, energy savings and demand reduction should be 20-40 percent of fan-system energy use and 5-10 percent of cooling energy use.