General description vhbw offers a clever solution with this G4 / F7 filter set designed for Zehnder ComfoD 300, 350, and 450 ventilation devices. This 2-part kit ensures your ventilation appliance is ready for use, providing effective filtration to maintain air quality. Technical specifications Dimensions per filter (L x W x D): approximately 50 x 17 x 1 cm Filter class: F7 (red pollen filter) / G4 (black coarse dust filter) Type: pollen filter / coarse dust filter Material: synthetic fibre / plastic Colour: black / white / red Compatibility and accessories Compatible with Zehnder ComfoD 300 Compatible with Zehnder ComfoD 350 Compatible with Zehnder ComfoD 450 Replacement for 400100084, EFS 380/550 GF, 400100084 Installation 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