The 3M Filtrete 4-Inch Micro Allergen Defense MPR1000 Air Filter is designed to enhance your home's air quality by effectively capturing allergens. With a MERV 11 rating, this filter excels at trapping particles without odor control, making it ideal for allergy sufferers. Measuring 20x25x4 inches, it fits most HVAC systems, ensuring a clean and healthy indoor environment.