The LESSCO Air-Vapor Barrier Box was developed in 1985 by Stephen Lentz, an airtight homebuilder at that time. The product has been on the market and used throughout the United States, including Alaska, since 1985.
It has endured extensive blower door testing on actual customer homes and has proven to be very effective in eliminating cold air infiltration and warm air exfiltration through electrical boxes and openings in exterior walls and ceilings. The LESSCO AVB Box has also been used with equal, outstanding results in commercial applications using steel framing, steel boxes, conduit and armored cable. The LESSCO AVB Box works equally as well with membrane application or the Airtight Drywall Approach-ADA.