Factory Supplied Plenum

Nailor 0755, 0755A, 0756, 0756D, 0757-CB, 0757-DB, 0757-EB, 0763-FB and 0763-GB Ceiling Dampers for use in Wood Truss ceilings are complete factory assemblies, UL 263 approved for installation in specific UL floor/ceiling and roof/ceiling designs.