Active Carbon Air Filter also named gas phase air filter or chemical filter.

Normally this kind of gas phase air filter media is  granular activated carbon or activated carbon cotton.

The gas phase air filter can be in cartridge active carbon type air filter , v cell filter carbon type air filter, z-line pleats type air filter, or honeycomb panle type air filter. 

The  removal of odor rate from 90%-99% according the odor concentration.