Zehnder - Filter set G4 (intake) and F7 (flow current) for Zehnder ventilation devices Comfoair Q 350/450/600 : Amazon.de: Home & Kitchen
Zehnder Filter Set Replacement Filter Air Filter G4 ComfoAir 70 527005180 Pack of 2 : Amazon.de: DIY & Tools
Alternatives Set Suits Zehnder Comfoair 350/550 °F7 Filter + 10x Alternative Cone Filter DN 125 : Amazon.de: Home & Kitchen
Zehnder ComfoBox Replacement Ventilation Filter Set Approx. 500 x 195 mm Filter Set Alternative Filter for ComfoAir 350/550 Alternative Filter for 400100085 Plastic Filter with Seal : Amazon.de: DIY & Tools