Air-Vapor Barrier Box

The LESSCO Air Vapor Barrier Box

The Problem

Moisture damage in wall caused by air leakage through outlet boxes

Moisture damage in wall caused by air leakage through outlet boxes

The Solution

Install air-tight LESSCO Air/Vapor Barrier Boxes

Install air-tight LESSCO Air/Vapor Barrier Boxes

LESSCO Air-Vapor Barrier Box

LESSCO Air Vapor Barrier Box

“The Perfect Addition to your Air-Tight Building System”

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  • New and Improved!
  • Features
  • Proven Results
  • Made in the USA!

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.

Hinged air vapor barrier box

  • Eliminates air leakage through electrical boxes
  • Prevents moisture damage in walls and ceilings
  • Improves comfort and energy efficiency
  • Easy to install
  • One size fits all electrical boxes
  • Dimensions: 6 1/2″ x 7 1/2″ x 3″ deep

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 Air-Vapor Barrier Box is manufactured in the United States using low density polyethylene plastic also manufactured in the United States.

The Low Energy Systems Supply Company, Inc. is owned by Stephen Lentz, an American disabled Vietnam Vet.

LESSCO Air Vapor Barrier Box