Overall, my top pick for the best 16x25x1 air filter is the Filtrete Allergen Defense manufactured by 3M. This filter has a high MERV rating, between 14 and 16, and is even suitable for hospital use. It uses 3M's patented 3-in-1 technology, which allows for greater airflow and captures more particulate matter. When it comes to air filters, size is an important factor to consider.
The nominal dimensions of this filter are 16 inches by 16 inches by 1 inch, but the actual measurements are 15.75 by 15.75 by 0.75. Therefore, it is important to measure the old air filter to ensure a proper fit. In addition to size, there are other factors to consider when choosing an air filter. These include MERV classification, number of folds, frame strength, and thickness. Generally speaking, more folds allow for greater airflow while still capturing the same amount of particles as a similar filter with fewer folds. Thicker filters require less frequent changing; however, they can also be more difficult to expel air and can cause overheating if the air conditioning system is not designed to work with them. On average, filters should be replaced every 3 to 12 months depending on their thickness.
Pet owners may prefer the Aerostar MERV 11 pleated air filter, which is designed specifically to trap pet dander and other allergens. For those looking for the best air filter overall, the NORDIC Pure MERV 12 pleated AC air filter is a great choice. I conducted extensive research when selecting my top pick for the best 16x25x1 air filter. This included carefully considering the MERV classification, size, thickness, and type of furnace filter, as well as any additional features the filter might offer. For those looking for an affordable option, this pack of six air filters uses electrostatic material to attract particulates and improve air filtration efficiency. The Filtrete 12x12x1 smart air filter is another great option that comes with a chip that measures air flow, filter usage, and filter life.
If you don't mind scrubbing the filter every few months, it may be more cost-effective to invest in a reusable filter. When creating a filter with this tool, it is important to use the “real” size of the filter as shown by the measuring tape and not a nominal size.