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 Paul Santos 370, 570 Ventilation Unit - Air Filter G4 / F7 (Pack of 2), 50 x 17 x 1 cm, White/Red/Black : Amazon.de: Home & Kitchen