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  Filtering recirculating air in residential heating & air conditioning systems serves mainly two purposes. One is the prevention of dirt accumulation on components like evaporator coils to maintain a good efficiency / low energy consumption rate.

The other benefit is the cleaning of the air from dust, allergens and irritating substances. Filters with high efficiencies usually have a tighter filter media which increases the flow resistance. While the filter is collecting more dust, the resistance increases even more, and the air volume (cfm = cubic feet per minute) decreases. High efficiency filters should be changed more often. Some filters use a MERV classification to rate it's efficiency. Common ratings are between 8 and 12, with MERV 12 being the most efficient filter.

Although filters do improve the indoor air quality (IAQ), they will not guarantee a low contaminant level. Filtered air on the return air side can pick up dust or mold from the ductwork. And for sure, everytime a person enters the room or a door is opened, some particulate matter comes in... Running the blower of the HVAC system all the time as a large air cleaning device is recommended sometimes for asthma or allergy sufferers.

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Synfil Technologies Synthetic HEPA for Air Purifiers and Vacuum Cleaners. All non-woven vacuum cleaner bags for all type of vacuum cleaners. Auto cabin air filter. High efficiency HVAC filters.
Air Cleaners, Inc. Manufacturer of air and grease filters.
Airguard Panel Filters, Extended Surface Pocket F., HEPA F., Antimicrobial F., Specialty Media and Filters, High Efficiency Residential System, Gas Phase Adsorbers, Dust Collector Cartridges, Self-supported Pocket F., Paint Spray Booth Filters.
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FILTERS-NOW.COM Inc. Air Filters, 3M Filtrete, Accumulair and VitalAir high-quality, high-performance home and office air filters at economical prices; drinking water filters.
The Filter Factory We focus on special applications such as cabin air filters, HVAC, electronic cabinet filters and enclosure filters, HEPA filters, new and replacement filters for range hoods and furnaces.
Quality Filters Inc. HVAC & paint filtration: rigid filters, synthetic bag filters, polyester panel & pocket filters, standard & high efficiency pleated panel filters.
RiteAir Air conditioner, furnace air filters, air purifiers and ionizers
WEB Products, Inc. Air Conditioning Filters, Furnace Filters and Allergy Filters.
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