ÖNORM EN 1751

This document specifies methods for the testing and rating of dampers and valves used in air distribution systems with pressure differences up to 2 000 Pa. The tests incorporated in this document will address: — leakage past a closed damper or valve (for classification see Annex C); — casing leakage (for classification see Annex C); — flow rate/pressure requirement characteristics; — torque: (see Annex A); — thermal transmittance: (see Annex B). The acoustic testing of dampers and valves is not included in this document. The tests specified above apply to the following: — measurement of leakage past a closed damper or valve; — measurement of casing leakage; — determination of flow rate and pressure requirements; — measurement of torque characteristics (see Annex A); — measurement of thermal transfer characteristics to determine insulation properties (see Annex B).