The BNX TruFilter 20x25x1 MERV 13 air filter is an electrostatic pleated 1-inch HVAC filter sold in a 6-pack — a full year of monthly replacements for one HVAC return or two months across multiple returns. MERV 13 captures particles down to 0.3 microns, including most allergens, pollen, mold spores, bacteria, smoke, and pet dander.
It fits any 20x25x1 return-air grille or HVAC unit. The electrostatic media uses synthetic fibers that hold a positive charge to attract negatively charged contaminants — providing higher filtration efficiency than standard pleated filters at the same airflow restriction.
BNX is an American air filter manufacturer producing the TruFilter line in the United States. The brand specializes in residential HVAC filter sizes with MERV 8, 11, and 13 ratings.