Compatible with Zehnder, Helios and Pluggit ventilation valves and exhaust air filters. Wide compatibility Designed to fit a range of Zehnder, Helios and Pluggit units, covering common models and systems used in residential and light commercial settings. material and precise fit tapered synthetic fleece media for reliable filtration and durability. About 8 mm thick, with a length of 180 mm and DN 125 mm connection, providing a secure fit for standard filter fleece housings. filtration efficiency G4 grade filtration captures dust and impurities effectively while maintaining airflow. The filter is built to resist impact and maintain performance over time, offering durable protection for the fan. Secure, energyefficient design Clean treated seams and maximum tightness prevent air leakage, supporting energy efficiency and minimizing noise from the ventilation system. Use scenarios Routine replacement in Zehnder, Helios or Pluggit ventilation systems during periodic maintenance to preserve air quality. Retrofit in existing homes or small offices to worn filters and restore performance without upgrading the entire system. installations or upgrades in energyefficient setups where a tight seal and quiet operation are important for overall system performance.