Type A 1803

The Overpressure Blast Valve Type A 1803 is used to stop explosive/implosive blast waves from entering a shelter or secure room, as well as to regulate the air pressure inside the space. The valve, normally closed, allows for an airflow rate of 500-2000 m³/h (300-1180 cfm). It is maintenance-free and withstands heat and corrosion. The springs are manufactured from special stainless steel and all steel parts are phosphate treated and finished with a powder coating.

Applicable Standards
  • SII 4570-1

    AIR VENTILATION AND FILTRATION SYSTEMS FOR SHELTERS AND PROTECTED SPACES: BLOWERS

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