Not to be confused with ducks or seals (the animal), duct sealing is a way to improve the heating, ventilation, and air conditioning (HVAC) in homes and buildings. It’s a process of sealing visible and invisible air leaks in air duct systems.

Duct seal is for sealing the outside of your home around electrical wires and other tiny gaps. It is not made for use on your leaky ductwork. Depending on the size of your leak, you may need to combine your liquid mastic with another product such as fiberglass mesh tape.