Compatibility Designed for use with Zehnder, Helios and Pluggit ventilation units and extractors. Fits duct connections with nominal diameter DN 125 mm and a filter length of 180 mm. Key features & materials G4 professionalgrade filter media: captures dust and larger airborne particles to protect fans and ductwork. quality synthetic fleece construction, approximately 8 mm thick, for reliable filtration and long service life. Durable, shatterproof construction that has been tested for longlasting performance. Precision seams and a tight seal to prevent air leakage, helping maintain system efficiency and reduce noise. Why you need this filter Protects ventilation fans and heat recovery units from dust buildup, reducing maintenance and extending equipment life. Maintains good indoor air quality by removing coarse dust and pollutants before they circulate through HVAC components. Tight sealing minimizes bypass and preserves airflow balance, supporting energyefficient operation and quieter performance. Practical applications Routine replacement filter for residential and light commercial heat recovery ventilation (HRV/ERV) systems made by Zehnder, Helios or Pluggit. Use during renovation or commissioning to ensure systems start clean and remain protected from construction dust. Ideal for periodic maintenance in kitchens, bathrooms, or utility rooms where extractors and ventilation units require robust coarse filtration. Performance & installation Simple dropin replacement for DN 125 filter housings; installs without special tools. Constructed to maintain filtration effectiveness while keeping pressure drop low, so the ventilation system runs efficiently. Recommend regular inspection and replacement according to your system manufacturer's maintenance schedule. Specifications (summary) Compatibility: Zehnder, Helios, Pluggit ventilation systems Length: 180 mm Nominal diameter: DN 125 mm Filter grade: G4 Material: synthetic fleece Thickness: approx. 8 mm Construction: durable, shatterproof, tightsealed seams this filter to keep your ventilation system protected, efficient and quieter while maintaining effective coarse particle filtration.