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A. A New Sealing System For Household Air Leaks

Narrator: This is Science Today. An efficient and innovative way to seal leaky air ducts may save homeowners hundreds of dollars a year in energy costs. Mark Modera, a staff scientist at the Lawrence Berkeley National Laboratory, devised a novel way to seal leaks in heating and cooling ducts by injecting vinyl acetate, an airborne sealant, directly into a pressurized system.

Modera: Think of it as really tiny pieces of caulking. We've basically made like caulking mist - a powder of caulking. When it dries it stays flexible, sort of dries like caulking and so you can build a bridge from the far side of the leak across to the other side of the leak.

Narrator: Unlike the more laborious task of repairing leaks from the outside, this internal, airborne sealing system is done in about an hour and is even tracked by computer while at work.

Modera: So you can essentially watch your duct system be sealed and then when it's done it'll print out a little certificate that'll show the homeowner exactly what was done to their duct system.

Narrator: Modera says the system is just starting to catch on commercially. For Science Today, I'm Larissa Branin.