Pressure relief dampers of PRD for the protection of internal spaces from differential pressures in excess of set maximum levels, when the set maximum differential pressure is exceeded, the blades. automatically open to relieve the excess pressure
Non-Return Dampers
Non-Return Damper which is an HVAC damper being used in the places where only one direction is required to flow air. Depending on the application, non-return dampers may be placed on the wall or duct. They are most frequently used in the presence of fans where the blades are only opened when the fan
