Now you can simply install it over your vent and cut out dust and pollen from outside.
Filters remove approximately 80% of dust and pollen. (Removes over 90% of cedar pollen.
To replace the filter, simply remove the cover and remove the filter inside
In the event of strong winds such as typhoons, the cover can be removed and installed upside down to reduce blowing.
It is recommended to replace pollen filters half to one year.