Cone Filters DN 125 Filter Ventilation System Exhaust Filter G4 Exhaust Filter Set. Cone filter DN 125 for ventilation valves Zehnder Helios Maico Exhaust air disc valves. Filter quality G4. Function: Suitable for ventilation valves Zehnder, Helios, Maico, Pluggit – suitable for exhaust air valves/throttle valves, conical filters for bathroom or guest toilet ventilation systems.
