The 3M Filtrete Dust & Pollen Furnace Filter is an electrostatically charged furnace filter ideal for high velocity HVAC systems. 3M Filtrete filters are an economical upgrade from cheap one month filters. The 3M Filtrete Dust & Pollen Filter is far more effective than the average washable or fiberglass disposable hvac air filter, which normally does not even remove dust from the air.The Dust & Pollen "Light Blue Series" Filter Reduces:Pollen - causes the immune system to produce large amounts of antibodies, which in turn causes chemicals such as histamines to be released. The release of these chemicals causes such symptoms as sneezing, runny nose, and watery eyes.Mold Spores - when mold found in wood, ceiling tiles, wallpaper, paint, carpet, sheet rock, and insulation is disturbed mold spores are released into the air. Mold spores can cause symptoms such as sneazing, runny nose, and itchy or watery eyes.