● The pressure relief valve PVA/PVB is used for preventing the reverse of airflow in circular
● The casing of PVA/PVB is made from galvanized steel, the blades are made of aluminium.
● PVA with an inner foam seal for better tightness and noise reduction.
● The valve opens when overpressure occurs and closes by means of spring when the pressure drops.
● It is recommended to install the shutter into the horizontal duct.
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