1. Power Adapter: This is the most common adapter used in air purifiers, as it provides electricity to the purifier in order to run the fan and other components and circulate the air.

2. Activated Carbon Filter: This is a filter that eliminates pollutants from the air. Activated carbon is incredibly porous and so it makes an excellent filter.

3. HEPA Filter: This is another type of filter used in air purifiers, that specializes in removing fine particles, as small as 0.3 microns, from the air.

4. Pre-Filter: This filter is used to capture bigger airborne particles before they can enter the other filters. This helps to extend the lifetime of the other filters.

5. UV Filter: An ultraviolet filter is used in some air purifiers to kill germs and bacteria, which can cause foul odors. UV light can also reduce the amount of mold and dust present in the air.