Rectangular Dampers / Slide Gates have frame, which is bended to 90 ° channel having specified flange-to-flange distance. The Dampers / Slide Gates have louvers with āVā shaped edge which are fixed through clit on connecting shafts, placed between bearing housing which are welded on frame at both ends of louver. The Dampers / Slide Gates have needle roller bearing, which are provided to have smooth movement of connecting shaft. The Rectangular Dampers / Slide Gates can be actuated manually, pneumatically or electrically and can be controlled for two positions having input control signed from DCS, PLC or PID.