High-Performance Return Grille Filters

Consider this: high peformance return grille filters from Honeywell provides air filtration equivalent to four-inch media filters in one-inch grille space. "The Return Grille Filter is up to 15 times more effective (based on initial efficiency analysis of new filters tested at 3 - 10 mcron particles at 295 feet per minute of airflow) than standard one-inch filters at trapping and filteringdust, as well as reducing pollen, mold spores, bacteria and other allergens passing through your HVAC system." - Honeywell International Inc. Description