The Tier1 16x25x4 air filter has nominal dimensions of 16" x 25" x 4" with actual dimensions of approximately 15.5" x 24.5" x 3.75". This pleated media filter is designed to fit standard 4-inch whole-house HVAC filter housings, including popular systems from Aprilaire, Honeywell, Lennox, and Carrier. Always verify your system's required dimensions before ordering to ensure proper fitment and an airtight seal.

The Tier1 16x25x4 air filter is available in a MERV 11 and MERV 13 rating. The MERV 11 version captures particles as small as 1.0–3.0 microns, including pollen, dust mites, mold spores, and pet dander, while the MERV 13 version captures particles down to 0.3 microns, including smoke, bacteria, virus carriers, and fine allergens. Both options provide superior indoor air quality compared to standard 1-inch fiberglass filters.

The Tier1 16x25x4 pleated air filter has a service life of up to 12 months under normal residential conditions, thanks to its deep 4-inch pleated design and high dust-holding capacity. Homes with pets, smokers, allergy sufferers, or those located in high-pollen or high-dust regions should inspect the filter every 6 months and replace it sooner if visibly dirty. Regular replacement maintains optimal airflow and protects your HVAC system.

Yes, the Tier1 16x25x4 is a direct replacement for several popular OEM filters, including Aprilaire 201, Honeywell FC100A1029, Lennox X0583, Bryant/Carrier FILBBFNC0017, and Totaline P102-1625. Its precise 16x25x4 nominal sizing and rigid beverage-board frame ensure a secure fit in compatible media air cleaner cabinets without bypass leakage.

The Tier1 16x25x4 features electrostatically charged synthetic pleated media supported by a rigid beverage-board frame and a metal mesh backing for structural integrity. The electrostatic charge enhances particle capture without restricting airflow, allowing the filter to trap small airborne particles efficiently while maintaining low pressure drop across your HVAC system—helping reduce energy consumption and extend equipment life.