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The Aerostar 21x21x1 MERV 13 pleated air filter is a replacement furnace filter for home HVAC, AC, vent, and air conditioner systems. Each filter has a nominal size of 21x21x1 and an actual size of 21.5x21.5x0.75. Measure your existing filter before ordering to confirm fit in your HVAC slot. The 6-pack provides up to months of replacement furnaces filters at the recommended 90-day change interval. MERV 13 filtration captures household dust, pollen, pet dander, mold spores, lint, fine dust, smoke particles, and some bacteria-sized particles for higher-level home air quality. The pleated design uses electrostatically charged synthetic media to attract and hold particles more effectively than flat fiberglass filters. Low airflow resistance helps maintain HVAC efficiency. The reinforced moisture-resistant frame prevents filter collapse and air bypass. Compatible with most major brands including Carrier, Bryant, Trane, Lennox, Rheem, Goodman, York, Ruud, and Honeywell furnace and air conditioner systems. Replace every 90 days under typical conditions, or every 30 days in homes with pets, smokers, or high dust levels. Made in USA. Designed to Fit: Nominal 21x21x1, actual size 21.5x21.5x0.75 MERV 13 Captures Dust, Pollen, Pet Dander, Smoke, and Bacteria Replacement Filter for Air Conditioners, Carrier, Trane, Lennox HVAC Vent 6-Pack, Replace Every 60 to 90 Days for Clean Home Air Pleated Electrostatic Media Captures More Particles Than Fiberglass Filters Heavy-Duty Frame, Reinforced Pleats Prevent Filter Collapse Measure Existing Filter Before Ordering to Verify HVAC Slot Size and Fit Fits Standard Furnace and AC Slot in Home HVAC Systems With Vent Filter Minimum efficiency reporting values (merv) 13 Contaminants removed Allergens, Bacteria, Dust, Dust Mites, Mold, Odor, Pet Dander, Pollen, Smoke, Viruses Brand Aerostar Features Electrostatic Microparticle performance rating 1500 Thickness 1 in Material Electrostatically Charged Synthetic Filter Media Rec. use Residential Dimensions 0.75 x 21.50 x 21.50 in Count 6 Product net content parent 6 Count Model 21 1/2x21 1/2x1-13-6 Has written warranty No