Fast Shipped Filters is a family-owned business in Swanton, Ohio that has been in the Heating Cooling & Air Purification industry since 1984 EFFECTIVE FILTRATION: Trap dust, pollen, and airborne particles to maintain cleaner indoor air. Manufactured in the United States ensuring quality and reliable performance If you own a Dynamic Electronic Air Cleaner, this 7-pack of replacement filter pads is exactly what you need to keep your air purification system running at... EFFECTIVE FILTRATION: Trap dust, pollen, and airborne particles to maintain cleaner indoor air. Replace Every 1 to 4 Months: Depending Local air quality for optimal performance. Polarized Pads, Made In USA 7 Pack 16x25 Filter Refills Dynamic Electronic Air Cleaner 16 X 25 X 1 Dynamic Air Cleaner - Airstar Solutions Dynamic Air Cleaner Refills 7 Pack Replacement Filter Pads Designed to Fit Dynamic Cleaner Frame Size 20x25x1