Comfenergy Case Studies: Ashburn VA HVAC Duct Spray Foam

Thursday, May 4th, 2023 by Dan Bomar

Challenge

The "mixer box" is the section of an HVAC duct system where it changes directions or splits off into more ducts. This duct joint area is often the source of lost conditioned air being pumped through it, making an HVAC system work less efficiently than it should, resulting in higher than needed energy bills. This attic HVAC duct system had 2 mixer boxes and was leaking a tremendous amount of conditioned air.

Solution

Spray Foam is an excellent solution to help insulate and air seal the mixer box joints. This keeps the box itself from becoming hot or cold during different times of year and seals up any gaps and cracks that were previously allowing air to escape.