General description vhbw offers a clever solution with this G4 / F7 filter set, designed specifically for Zehnder ventilation devices. This 2-part kit ensures your ventilation appliance is ready for use again by effectively filtering out impurities from the air. Technical specifications Dimensions per filter (L x W x D): approximately 50 x 16 x 1 cm Filter class: G4 / F7 Type: pollen filter / coarse dust filter Material: synthetic fibre / plastic Colour: white / green / yellow Installation The filters can be inserted quickly and without tools into the slide compartment of the ventilation unit. Usage The coarse dust filter removes hair, insects, sand, and other coarse dust from the air drawn into the unit. The pollen filter provides additional protection against fine dust and pollen. Regularly changing the filters is recommended to maintain optimal filter performance. This filter set allows you to upgrade your ventilation unit to pollen filter class (F7) without the need for external