Here you can see all of the filters pulled out of the Air Hawk unit.

Here you can see the PCO (Photo Catalytic Oxidizer) chamber

Stage I—PREFILTER:
The Air Hawk is equipped with a pleated prefilter.  The media is 100% synthetic fiber with expanded metal reinforcement, laminated to the air leaving side of the media.  The media is supported in a moisture resistant beverage board frame.  This filter is rated class 2 under U.L. std. 900.

Stage II—PRIMARY FILTER: 

The Air Hawk is equipped with a HEPA (High Efficiency Particulate Arrestor) filter.  The media is manufactured with high efficiency glass micro fiber media, gently pleated to form the media pack.  Rolled edge aluminum separators are inserted between each pleat.  A heavy duty galvanized frame encapsulates the media pack.

Stage III—GAS PHASE FILTER:

The gas phase filter holds approximately 0.5 cubic feet of gas phase filter media.  The media used on gaseous pollutants is a 50/50 blend, by volume, of coconut shell  activated carbon and zeolite, impregnated with potassium permanganate.  The filter will hold approximately 24 pounds of this blend.

The coconut shell activated carbon has thousands of tiny pores that adsorb/trap Volatile Organic Compounds (VOC's).  These include compounds like benzene, toluene, acetic acid and phenol.    Inorganic compounds like sulfur dioxide, mercaptans and acid gases are removed by the oxidation properties of the potassium permanganate.  The compounds react with the chemical and are deposited into the pore structure of the zeolite.

An example of a pollutant gas stream, using the blended material, is diesel exhaust:  In diesel exhaust, you form compounds that carbon will adsorb and acid gases that will react with the potassium permanganate.

Stage IV—PCO (Photo catalytic Oxidizer):

The titanium dioxide grid is activated by various wavelengths of ultraviolet light.  When activation occurs,  toxic compounds such as carbon monoxide and nitrous oxide, are converted into benign constituents such as carbon dioxide and water vapor.