General description vhbw offers a high-quality 4 Part Filter Set designed specifically for Viessmann ZK01767 humidifiers and ventilation systems. This filter set enhances indoor air quality by effectively removing pollutants and impurities, ensuring a pleasant and healthy environment in your home. It is essential for maintaining the efficiency and reliability of your ventilation system. Technical specifications Exhaust Filter: 2 units Filter classification: G4 Dimensions: 26 x 17.8 x 2.3 cm Colour: white Intake Filter: 2 units Filter classification: F7 Dimensions: 26.1 x 16.2 x 4.3 cm Colour: white Usage The filter set is designed to efficiently remove a variety of indoor air pollutants, including dust, fine dust, pollen, allergens, bacteria, and mould spores. It also effectively eliminates cigarette smoke, exhaust fumes, chemical vapours, and unwanted odours from the air. Other information It is recommended to change the filters regularly, depending on usage frequency.