I'm proud to announce that Vent Cap Systems has been approved by The Building Performance Institute™ (BPI) for inclusion as a BPI Listed Product.  BPI Listed Products are matched to specific home performance testing standards and other criterion.   Coming on the heels of the USPTO's recent issuance of our patent is certainly welcome news after over five years in the business.  Both are further recognition that Vent Caps are both novel, functional, and necessary tools for anyone doing duct leakage testing.