Founded in 1927, Nissen & Co, Inc is a manufacturer specializing in custom commercial sliding service windows, ticket windows, and fire windows. Our sliding service windows are manufactured with heavy extruded aluminum frames for the best quality in the industry. Our windows feature a trackless design for obstruction-free counter-top serving areas. Ball bearing rollers available for large size windows. We can fabricate many different window configurations and combinations to fit the toughest applications. Our Fire Windows are steel frame, I.C.B.O. approved. Fire resistant rating of 45 minutes in wall construction of masonry, wood or steel studs per report number 2781, as tested under fire tests of window assemblies, A.S.T.M.E. 163-65 and National Fire Protection Association number 257-70.