Zehnder STR extraction ventilation valve

The STR valve is designed for systems where continuous air extraction with variations at the pressure levels is required. Balancing is superfluous when these values are installed.
The ventilation valve is manufactured from of recyclable and solid polystyrene plastic and the fixing ring has a rubber seal. The STR valves are available in various models.
The STR valve with one air volume has a pressure module. Depending on the
factory settings (30, 45, 60, 75 or 90) the valve opening changes when pressure differences are detected. This means that the air flow remains constant. The STR valve has two air volumes which can be adjusted by pulling the cord in the valve opening which then increases or decreases the air flow.
The STR valve is suitable for mounting in the wall or ceiling. The valve with two air volumes cannot be fitted with a ø100 mm fixing ring. An intermediate ring is available for this purpose. When the valve with two air volumes is mounted in the ceiling, a cord guide is available to bring the cord to the wall.