vhbw Filter Set G4 + F7 (Exhaust Filter & Supply Air Filter) Compatible with Viessmann Vitovent 200-C Home Ventilation System - Replacement for Fine Filter Set 7543981 : Amazon.de: DIY & Tools
vhbw Filter Set compatible with Zehnder ComfoAir 180 Ventilation Devices - Air Filter G4 / F7 (2-Part