The 16x24x1 filter on this page is the 3M Filtrete 1500 Ultra Allergen, rated MERV 12 on 3M's chart and sold as a 4-pack. Change it at least every 3 months. A 16x25x1 is a different size, so buy the exact size printed on your current filter.
The Filtrete 1500 16x24x1 is a 1-inch filter rated MPR 1500, which 3M's MPR-to-MERV chart lists as MERV 12.
Looking for another size? Browse air filters by size.
Buy the exact size printed on your current filter rather than substituting a 16x25x1. A filter of the wrong size may not fit the slot, or it may leave gaps around its edges. If your old filter says 16x25x1, shop our 16x25x1 air filters instead.
Filtrete 1500 is MERV 12, based on 3M's MPR-to-MERV conversion chart. MPR is 3M's own rating for Filtrete filters, while MERV is the industry-wide scale that lets you compare filters across brands.