PREpleat AC

This filter combines the low resistance and high DHC of a pleated filter with the odor removing abilities of activated carbon. The base filtration medium is polyester synthetic fiber, with a generous 100% add-on of activated carbon by weight (the weight of activated carbon equals the weight of the media to which it is adhered). As odor producing gases come in contact with the activated carbon in the filter, they are adsorbed, trapped, and held in millions of microscopic carbon pores.

Construction

The filter medium is comprised of a polyester synthetic fiber felt with an add-on of powdered, activated carbon. This medium is adhered with hot-melt adhesive to an expanded metal backing, then folded into an accordion pleat arrangement. This media pack is encased and sealed within a moisture resistant kraft board frame.

Activity Level

The ability of activated carbon to catch and hold a gas or vapor is referred to as its level of activity. The higher the activity level, the higher its adsorption level. The activated carbon used in this filter is a coconut shell material with an activity level of 60% or more when subjected to the most common test, using carbon tetrachloride.

However, the effectiveness of activated carbon generally varies considerably, depending upon the odor or vapor to be removed. Typically, the adsorptive capacity of activated carbon is higher for those adsorbates with higher molecular weights and boiling points. A chart on the back side of this sheet lists this activated carbon’s typical effectiveness on various substances, with a ranking from 1 (low effectiveness) to 4 (high, typically adsorbs to a level of 20% or more of the carbon’s weight).