This European Standard specifies methods forThe testing and rating of dampers and values used in air distribution systems with pressure differences up to 2000 pa.
EN 1751:1998 history
2014EN 1751:2014 Ventilation for buildings - Air terminal devices - Aerodynamic testing of damper and valves
1998EN 1751:1998 Ventilation for Buildings - Air Terminal Devices - Aerodynamic Testing of Dampers and Valves