The Tier1 16x25x1 furnace air filter carries a MERV 13 rating, which is equivalent to MPR 1500 and FPR 10. This high-efficiency pleated filter captures up to 90% of airborne particles as small as 1 micron, including pollen, pet dander, dust mites, mold spores, smoke, smog, and bacteria, making it ideal for households with allergy sufferers or pets.

The actual dimensions of this Tier1 filter are 15.5" x 24.5" x 0.75", while the nominal size is listed as 16x25x1. These slightly undersized actual measurements are standard in the HVAC industry and ensure a proper fit within 16x25x1 furnace and air handler slots without binding or gapping.

Tier1 recommends replacing this 16x25x1 pleated filter every 90 days under normal conditions. However, homes with pets, smokers, or residents with allergies should inspect the filter every 30–60 days and replace it sooner if it appears loaded with debris. Regular replacement maintains proper airflow and protects your HVAC system from strain.

The Tier1 16x25x1 furnace filter features a synthetic electrostatically charged media with a beverage board frame for rigidity. The pleated design increases surface area for better dust-holding capacity, while the electrostatic charge attracts and traps smaller microscopic particles that flat-panel fiberglass filters typically miss.

Yes, this Tier1 16x25x1x1 filter is designed as a universal replacement that fits any furnace, air handler, or return air grille requiring a nominal 16x25x1 filter. It is a direct alternative to brands like Filtrete, Honeywell, and Nordic Pure in the same size and MERV 13 class, delivering comparable performance at a lower cost.