Many HEPA Air Cleaners and HEPA air purifiers include a certain amount of activated carbon to absorb and remove odors and out-gassing chemicals from the indoor air environment. Some of these carbon filters are mixed with a mineral called zeolite, which does a great job of absorbing ammonia and urine odors. The more activated or carbon and zeolite in the HEPA air cleaner, the more odors and out-gassing chemicals can be removed from your indoor air environment. Activated carbon and zeolite can remove a huge cocktail of chemicals that out-gas from carpeting, furniture, pesticides, paints, cleaning products and household building materials. Most quality HEPA air cleaners will include between 3 1/2 and 15 pounds of activated carbon. It is important to replace the carbon as needed.
The lesser the carbon the more often it should be replaced. Replacement carbon filters are normally inexpensive and easy to replace. Beware of low quality air cleaners that claim that they have activated carbon in them. Most of the inexpensive low quality air cleaners only use a very, very small amount of carbon dust that is impregnated into a replaceable sponge, foam or fibrous pre-filter. I can assure you that a few ounces of carbon dust will not do a good job of removing out-gassing chemicals and odors. Filters impregnated with carbon dust, is nothing more then a marketing scheme and it is all show and no go!
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