Smoke Evac Systems in ORs

Is there a code requirement that ORs without outside windows must have engineered a smoke evacuation system?

Yes.  It is in NFPA 99 but it is not a traditional engineered smoke evacuation system.  The intent is to keep one OR from bringing the others out of service.
 
2005 NFPA 99
6.4.1.3 Ventilating systems for anesthetizing locations shall be provided that automatically (1) prevent recirculation of smoke originating within the surgical suite and (2) prevent the circulation of smoke entering the system intake, without in either case interfering with the exhaust function of the system.