Nailor Model 0722 Ceiling Dampers are for use in round apps, in lieu of hinged door sort dampers in any UL/ULC ground/ceiling or roof/ceiling assembly with as many as a 3 hour fire resistance ranking where air ducts are authorized. 1210SS Collection dampers are created and tested to supply quality efficiency and gives the lowest https://dampers-for-industrial-se23444.pages10.com/not-known-details-about-dampers-for-industrial-sector-72179930