- Research Products Corporation
 - Designs and manufactures humidifiers, air cleaners and exchangers, zone control systems, and electronic thermostats. - A-I Consolidated
- Sells consumer electronics, pro sound components, computer software and hardware, and air and water purifiers.
- ClearFlite Air Purifiers
- Air purifiers that use HEPA technology filters to clean indoor air.
- BPA Air Quality Solutions
- Offers residential, commercial, and industrial air purifiers, smoke eaters, mist collectors, fume extractors, dust collectors, UV sterilizers, and laser particle counters.
- Original Fresh Air Machine, The
- Offers air purifiers, product comparisons, and buyers' guides.
- BestFilters.com
- Sells leading brands of residential water filters and air purifiers as well as replacement filters.
- Air Purifiers USA
- Specialises in air purifiers and filters for allergy, asthma, bacteria, chemical attack, dander, dust, gas, mould, tobacco smoke, and odour control.
- Achoo! Allergy & Air Products
- Vendor for HEPA air purifiers and vacuum cleaners, dust mite bedding, healthy mattresses, and asthma management tools.
- Pure n Natural Systems
- Offers air and water filtration systems, HEPA, ultraviolet and other whole house air cleaners purifiers and filters.
- Air Filter Store, The
- Offers electrostatic air filters and air cleaners for rooms and automobiles.
- Air Sponge Filter Company
- Patented air filters for removing harmful contaminants.
- Ionic Zone, Inc.
- Sellers of a wide range of air purifiers and air cleaners from major brands.
- AirFilterStore.com
- Specialises in HEPA air filters.
- American Air & Water
- Offers residential and commercial UV air cleaners and water purifiers that use UVC light for healthier indoor air with HVAC UV marketing support available.
- Absolute Air Cleaners & Allergy Products
- Offers a variety of products for dust, allergy, and asthma control.
- Air-Cleaners.org
- Sells air cleaners using HEPA or electrostatic technology.
- AirShack.com
- Offers HEPA air cleaners, purifiers, and replacement filters.
- Alpine Home Air Products
- Retailer of do-it-yourself residential HVAC equipment, including air conditioners, air cleaners, humidifiers, and more.
- E.L. Foust Co.
- Air purification, water filtration, HVAC filters, and other products for residential and commercial applications.
- PuriTec
- Offers air cleaners and water filters for home and business applications.
- A1 Air Filters
- Offers HEPA, electrostatic carbon filters, ionic air purifiers, and allergy bedding for relief from dustmites, mould, pollen, and pet dander.
- Peak Pure Air
- Sells air purifiers, cleaners, and ionizers.
- Filters AMERICA
- Offers replacement air filters.
- FiltersUSA
- Offers portable and house air filters.
- PurifierIdeas.com
- Online store providing product reviews and testing for home air purifiers, HEPA filters, and commercial air cleaners from Neoair, IQAir, Austin, Biozone, and others.
- Air Oasis
- Manufacturers of advanced air purifier products to help reduce mould, bacteria, viruses, VOCs, odours, and more.
- Air Purifiers America
- Offers a wide selection of HEPA and electrostatic air purifiers with consumer ratings on each product.
- Sylvane
- Providing HEPA air filters, electronic air cleaners, and reviews of air purifiers for home and commercial air purification.
- Campbell Environmental Systems
- Provides products for home and office, including air filters, water filters for sinks and pools, and vacuums.
- Clean Air Delivery Rate
- Information on the Association of Home Appliance Manufacturers certified air cleaners and products.
- FilterSavings.com
- Offers HEPA air filters for furnaces, as well as air conditioner, humidifier, and air cleaner products.
- Clean Air Plus
- Offers environmental control products such as HEPA air purifiers, de-chlorinating shower filters, cotton pillows, and mattresses.
- Filters-NOW.com
- Provides electrostatically charged 3M, custom size, and their own brand of air filters.
- AirPurifiersandFilters.com
- Offers high-performance HEPA air cleaners for allergy, dust, asthma, smoke, mould, odour, gas, and chemical control.
- Gazoontite
- Offers products for people suffering from allergies or asthma. Also has chat events, message boards, and information.
- Heaven Fresh Air Purifiers
- Sells a variety of HEPA and silent ionic air purifiers, indoor air cleaners, and ionizers.
- Austin Air Systems
- Manufacturer of the air cleaner for home or business.
- American Filtration
- Replacement filters for residential and commercial systems.
- Your Filter Connection
- Distributor of 3M Filtrete home air filters and Accumulair air conditioning filters and heater filters.
- Blueair
- Offers a variety of air purification solutions.
- Rickscleanair.com
- Offers air purification systems, ozone machines, negative ion generators, and clean air consulting services.
- ToxicMoldUSA.com
- Articles, tips, and other resources on black mould, toxic mould, mildew, and the harmful mycotoxins they can produce.
- IAQ Source
- Offers indoor air quality products including filters, air cleaners, humidifiers, dehumidifiers, thermostats, and portable air conditioners.
- Troy Filters, Ltd
- Manufacturer and distributor of filter products for HVAC, mist collection, dust collection, air, liquid, and more.
- NanoTwin Technologies
- Direct online sales for the NanoBreeze brand of air purifiers and cleaners that use photocatalytic nanotechnology.
- Accu-Temp Heating & Air Conditioning
- Offers humidifiers, filters, and air cleaning products online, as well as installation services.
- Bel-Aire
- Repair and parts for electronic air cleaners.
- Clairion Home Care Products, Inc.
- Producer of an air filter, ionizer and ceiling fan all in one.
- Purity Home Products
- Produces filters designed for home furnace systems, electronic air cleaners, air conditioners, and more.
- Web Products, Inc
- Electrostatic furnace filters for improved air quality and allergy relief in the home.
- U.S. Home Filter
- Offers standard and custom residential furnace air filters that remove dust, pollen, allergens, smoke, and other particles.
- Filter Market
- Sells anti-allergen products including Filtrete furnace filters in every size.
- Air-Purifiers-Cleaners.com
- Sells hepa filters and purifiers for allergy, asthma, second hand smoke, pollution, and dust mites.
- Air Probe Sanitizer
- Uses ultraviolet air purification designed to eliminate allergens and odour in heating and air conditioning systems.
- Filters 4 Home
- Offers pleated air-conditioning and heating filters, in a range of sizes, for the home.
- FiltersRx.com
- Offering commercial and industrial air filters direct from the manufacturer.
- Allied Technologies
- Offers ionizers, negative ion generators, air purifiers, and industrial odour eliminator for allergies, asthma, sinuses, and pollution.
- Enhance-It
- Makers of a UV light air purification and sterilization system.
- Quantum Pure Aire Corp
- Specialising in air purification systems.
- Care Tech Industries
- Offers the Odatus line of O3 purifiers.
- Air Purifier Guide
- Features a guide to air purifiers, from portable purifiers to whole house air cleaner systems.
- AirAndAqua.com
- Provides air and water purifiers, air conditioners, glass water bottles, solar products, atmospheric water generators, and more.
- Clarkstown Heating & Air Conditioning
- Provides replacement filters and refill cartridge media for heating and air conditioning units.
- AirCleaners.us
- Lists air cleaner and purifier dealers, installers, manufacturers, and related indoor air quality information.
- True Blue Company
- Residential and industrial air filters.
- Lifetime Filter
- Offers electrostatic air filters, thermostats, and smoke alarms.
- Air Purifier Power
- Consumer oriented site with detailed information about buying air cleaners and purifiers.
- Living Air Classic
- Air purification system for indoor areas.
- PurifierPro.com
- Offering Swiss-crafted IQ Air products including air purifiers and filters.
- Air Purifying Systems
- To reduce symptoms of mould, allergies, and asthma.
- FeelGoodWellness.com
- Health and wellness information and products using proven methods of pain management, rehabilitation, stress relief, and relaxation. Includes air purifiers, magnetic therapy products, and more.
- W.J.S.
- Allergy free and electro-static filters for home and business use.
- Envirofilters.com
- Offers humidifier pads, replacement media for furnace filters, and other replacement parts for many brands of furnaces, humidifiers, and air purifiers.
- ChooseAirPurifier.Com
- Sells air purifier for use inside cars to help filter gas and exhaust fumes.
- Himalayan Valley Imports
- Sells Himalayan rock salt lamps which act as ionizers and air purifiers.
- IA HEPA Replacement Filters
- Offers filters for Duracraft, Honeywell Enviracaire, and Hunter HEPAtech air purifiers.
- Best A/C Filter
- Sells air filters for home use.
- BreatheZ Portable Air Purifiers
- Offers portable air purifiers and ionizers for homes, cars, vans, and trucks featuring a five stage filtering system for smoke, germs, and bacteria.
- Filter Queen Defender Room Air Cleaner
- Air filtration system providing dust control to help prevent allergies.
- Scented Air Filters
- Manufacturer of HVAC scented air filters for residences or businesses. Also offers scented ceiling fan blade strips.
- sumiworld
- Sells Japanese charcoal for purifying water and air.
- Caware International
- Manufacturer of water filter cartridges, air filtration products, and activated carbon. Lists specifications, services, and contact information.
- CleaneAire
- Sells air purification products that use ultraviolet technology to eliminate viruses, bacteria, pet dander, dust mites, odour, mould spores, and smoke.
- AustinAirCleaners.com
- Distributor of Austin Air Cleaners for removal of allergen particles and absorption of ammonia, benzene, chlorine, formaldehyde, and nicotine.
- SREC Home Defense System
- Provides vacuum styled HEPA filtration systems to reduce indoor pollution and allergens.
- Brooke's Appliances
- Online store offering deluxe vacuum cleaners and air purifiers and humidifiers. Brooke's Appliances offers products from Miele, Bosch, Electrolux, Dyson, Air-O-Swiss, Austin, Air, and IQAir.
- Mountain Air Purifier
- Online shop for EcoQuest air purifiers that keep indoor air fresh and clean smelling day and night. Also helps to eliminate dust, smoke, mould, pet odour, pollen, allergens, and bacteria.
- AirDalton.com
- Sells indoor air purifiers for asthma and allergy relief and the elimination of odours, bacteria, moulds, and mildew.
- Designed Heating & Cooling Corp.
- Sells air filters, humidifier pads, electronic air cleaners, and replacement parts.
- Schill's Humidifier Service
- Offers humidifiers, air purifiers, accessories, and parts.
- Air & Water
- Provides high quality residential and commercial heating and cooling products and home appliances that are always efficient and dependable.
- Air Purifiers Direct 2U
- Online air purifier superstore. Air Purifiers Direct 2U helps customers find the perfect air purification solution to meet their needs.
- Air Purifiers Superstore
- Sells air purifiers, furnace filters, IAQ test kits, commercial ozone generators, and water ozonators.
- All-Air-Purifiers.Com
- Offers researched information and expert advise on different brands of air purifiers.
- Alpine Air Technologies
- Looking for an Ecoquest air purifier or Fresh Air by Ecoquest? Try the Fresh Air Living Lightning Air Purifier to reduce indoor air pollution in 15 minutes. Alleviate upper respiratory problems.
- Aprilaire Parts House
- Online store offering Aprilaire humidifier and air cleaner parts for all Aprilaire units.
- Best Air Purifiers
- Offers a range of air purifiers in a variety of sizes. The units use a patented technology designed by NASA for use in spacecraft and can remove odours, smoke, dust, pollen, mould, and more.
- Consumer Reports - Air Purifiers
- Recommendations and advice on different air purifiers and filters. Subscribtion neccessary for full ratings.
- Discount Furnace Filters & Humidifiers
- Offers Lennox filters, Aprilaire humidifiers, air conditioners, electronic air cleaners, and thermostats.
- Filters4life
- Online shop offering furnace filters and humidifier water panels, with quantity discounts available.
- How to Choose the Best Air Purifier
- Detailed informational guide on choosing the best air purifier.
- Kathy Ireland Home Air Purifiers
- Affordable air purifiers with HEPA filters, UV lamps, and other accessories to control dust, smoke, and pollen for homes.
- My Air Purifier
- Sells air purifiers and air cleaners for residential and commercial applications.
- On Time Mall
- Sells humidifier and air cleaner parts directly from the source.
- Pure Air Products
- Offers air purifiers, dehumidifiers, humidifiers, fans, central vacuums, and other ventilation products for improved indoor air quality.
- Purer Air
- Offers HEPA air purifiers and replacement filters for the improvement of indoor air quality. Site features photos and product descriptions.
- RabbitAir Air Purifiers
- Manufacturer and wholesaler of next generation HEPA air purification systems for home and office.
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