As of March 2015, websites for iAllergy, Office Depot and Amazon.com state that they discount Honeywell Enviracaire air purifiers. The original price or other retailer's price is listed alongside each store's discount.
IAllergy offers Enviracaire model 50250-S, which covers 390 square feet, making it suitable for a large room. The air purifier's dimensions are 18 inches wide by 18 inches deep by 19 inches high. This appliance is very similar to the discontinued model 50250-N. The purifiers offered at Amazon.com and Office Depot are similar-sized models.
Enviracaire air purifiers help trap 99.97 percent of allergens and air particles such as bacteria, mold spores, fungi, pollen, cat dander, dust and tobacco smoke, according to iAllergy and Office Depot. The appliance handles substances as small as 0.3 microns. In some models, a new HEPA filter should be installed every three years, while the carbon pre-filter replacement time line is three months. The version from Office Depot has a lifetime HEPA filter that requires vacuuming twice annually. The appliances have indicators that remind users when to clean or replace filters.
Honeywell's Enviracaire air purifier is round, has three speeds and has 360-degree air intake and discharge. The company offers a five-year limited warranty.