High Performance. Narrow Profile. For exceptional efficiency in a narrower profile, Ruskin® Data Center Series Dampers feature high-performance airfoil blades, a Class 1A leakage rating* and an all-new coupler option that joins two damper sections without a jackshaft. *AMCA Class 1A leakage is defined as 3 cfm @ 1-in.wg. ruskin.comhttp://www.ruskin.com