1. For Zehnder / Helios / Maico / Pluggit ventilation valves 2. Installation is very simple 3. The joints are tight and do not leak air, with high efficiency and low noise 4. Replacing the filter can protect your fan, environmentally friendly and reusable once 5. Applicable to exhaust valves / disc valve ventilation devices, conical filters for bathroom or guest bathroom ventilation systems 6. Size: length: about 18cm, Inner diameter: about 12.5cm
