Cold air infiltration / warm air exfiltration through electrical boxes
Install air-tight LESSCO Air/Vapor Barrier Boxes
“The Perfect Addition to your Air-Tight Building System”
The new, improved LESSCO Air-Vapor Barrier Box has incorporated a unique “hinge” feature. In the past, certain electrical sidewall and ceiling boxes were difficult or impossible to use with the LESSCO AVB Box. The new, unique hinge design makes virtually all current electrical boxes compatible with the new and improved LESSCO AVB Box.
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.