The Model ABV is pressure independent and designed to help combat stack effect.
The complete ABV & fire damper assembly is UL 555 Rated and Approved up to 1-1/2 hours.
The complete assembly is UL 555C Rated and Approved up to 3 hours.
AAB products are sold exclusively through our broad network of manufacturer's representatives knowledgeable in all phases of HVAC design and selection. Please follow the link to the Rep Locator to find the AAB representative in your area.