Filtrete 600 Dust & Pollen filters are rated MPR 600, which equals MERV 7 on 3M's MPR-to-MERV chart. This page carries them in 16x25x1, 20x25x1 and 16x20x1 sizes, each in a 4-pack. Change them at least every 3 months, as Filtrete recommends for 1-inch filters.
Filtrete 600 is MERV 7, according to 3M's MPR-to-MERV conversion chart. That places it below the Filtrete 1000, which is MERV 11, and the Filtrete 1500, which is MERV 12, in Filtrete's lineup.
This page carries Filtrete 600 Dust & Pollen in 16x25x1, 20x25x1 and 16x20x1, each in a 4-pack. For other filters in the two most common sizes, see our 16x25x1 air filters and 20x25x1 air filters.