Airguard, Purolator, Honeywell Air Filters - Air Filter Sales Welcome to Air Filter Sales Air Filter Sales is a stocking distributor of Airguard , Purolator , and Honeywell Air Filters. We can ship from our state of the art warehouse in Haverhill, MA, as well as from our supplier's factories throughout the US The range of our product line covers everything from disposable furnace type filters to the highest efficiency HEPA filters. SUMMER SALE Three Space Gard Replacement Filters Our Space Gard (or Spaceguard as they are often called) replacement filters are made by Purolator. That means when