Some homeowners might not realize that their home’s HVAC system could be harboring dust and allergens, which can lead to health problems and allergies. Fortunately, an air filter (16x25x4 furnace filter ) for your HVAC unit can help reduce the amount of dust particles and allergens that pass through your indoor air. In the Media & Tech Lab, we test and review air filters for efficiency, including the type and amount of dust particles they can filter. We test filters by placing them in a test chamber and measuring the amount of dust they filter. Test results are published on…