The filter housing, as selected, is described as having multiple sub-chambers internally for storing ammonia.

By utilizing the aforementioned skill plan, the airbag is divided into multiple sub-cavities, with ammonia gas evenly stored within. This configuration prevents the release of all ammonia gas when insects invade a particular area, avoiding a pungent odor. Moreover, this setup does not become ineffective after a single insect invasion, eliminating the need to replace the airbag and waste materials.

The cover features multiple D-shaped through-holes at the beginning, with a waterproof and breathable membrane installed on the D-shaped through-holes.

After selecting the above skill plan, the relative molecular weight of ammonia is less than that of air, thus the released ammonia will tend to move upwards; ammonia can escape outward through the di two-way hole; in addition, during the operation of the filter, the heat generated by the internal electronic components can also be dissipated through the di two-way hole, preventing heat accumulation in the filter housing and causing the internal electronic components to heat up, which increases resistance and affects normal operation.