Adsorption Yield: the higher the number the better the filters ability to remove odor.

Ball Pan Hardness:  This is a test in which a metal ball measures the hardness of the carbon by smashing it. The harder the carbon, the better/more effective.

Butane Number: This is a standard test to determine carbon capacity. With a quick look at this the user would assume the higher the number the better. In some cases this is true, however our users are using these filters for organic odors which need a smaller space to order to be captured.

Filter Length: Why is the “filter length" measurement on label important? The competitors state that their filters are 4x8, 6x24, 10x24 etc. That’s pretty much the industry standard however, their measurements include the 2” flange which contains absolutely no carbon. This means the user is getting 2” less of filter and carbon combined!!! When you buy a 24” Phat Filter, you are in fact getting a filter that’s filter bed is 2” thick x 24” long.

Mesh Size: The smaller the mesh the larger the carbon. Phat is the largest in the industry; this increases its ability to retain odors.

Virgin Activated Carbon: Virgin: Never been used before. Activated: The carbon is activated by steam or high temperatures. The objective is to knock ash from the pores of the carbon. Some manufacturers claim double/triple activation this does NOT increase the capacity to retain odor, in fact it lessens it. Multiple activation decreases the weight of the carbon by breaking internal fissures, this process in turn decreases the carbons ability to filter air.