General description vhbw offers a high-quality 4-part filter set designed specifically for Viessmann 7543981 humidifiers and ventilation systems. This filter set enhances indoor air quality by efficiently removing pollutants and impurities, ensuring a pleasant and healthy environment in your home. It effectively eliminates dust, fine dust, pollen, allergens, bacteria, mould spores, cigarette smoke, exhaust fumes, chemical vapours, and unwanted odours from the air. Technical specifications Exhaust filter classification: G4 Exhaust filter dimensions: 26 x 17.8 x 2.3 cm Intake filter classification: F7 Intake filter dimensions: 26.1 x 16.2 x 4.3 cm Colour: white Usage It is recommended to change the filters regularly, depending on the frequency of use, to maintain optimal performance of your ventilation system.