The Tier1 16x25x1 air filter features a MERV 13 rating, making it one of the most efficient pleated filters for residential HVAC systems. It captures 90%+ of airborne particles down to 1 micron, including dust, pollen, pet dander, mold spores, smoke, smog, bacteria, and virus carriers. This makes it ideal for households with allergy sufferers or pets while still maintaining strong airflow through your furnace or AC system.

The nominal size is 16x25x1 inches, while the actual dimensions measure approximately 15.5x24.5x0.75 inches — the industry standard for this size. This 6-pack is engineered to fit any furnace, air handler, or return-air grille that requires a 16x25x1 filter. Always verify the size printed on the side of your existing filter before ordering to ensure compatibility.

Tier1 recommends replacing this pleated air filter every 90 days under normal conditions. However, homes with pets, smokers, or residents with allergies should replace it every 30–60 days for optimal indoor air quality. The 6-pack provides an 18-month supply based on a 90-day replacement cycle, ensuring you always have a fresh filter on hand to maintain HVAC efficiency and prevent strain on your system.

The Tier1 16x25x1 filter is constructed with an electrostatically charged synthetic pleated media supported by a beverage-board frame for rigidity. The electrostatic charge attracts and traps microscopic particles that standard fiberglass filters miss, while the deep pleats increase surface area for greater dust-holding capacity and extended filter life. Unlike washable filters, this is a disposable filter designed for single-use replacement.

The Tier1 16x25x1 MERV 13 filter is specifically engineered with optimized pleat spacing to deliver high filtration efficiency without significantly restricting airflow in most residential HVAC systems. While MERV 13 captures finer particles than lower-rated filters, Tier1's design maintains balanced static pressure. If you have an older or low-powered system, monitor airflow after installation and replace the filter promptly every 90 days to prevent buildup that could strain your blower motor.