13x21 1/2x1 Merv 11 Universal Air Filter By Tier1 (6-Pack) Flatrate45_99 on-the-go use

on-the-go use

The 20-inch x 4

or any other system with a 1-inch outlet

75-inch for use in high chlorine reduction applications in most standard 10-inch filter housings

this premium replacement delivers clean

13x21 1/2x1 Merv 11 Universal Air Filter By Tier1 (6-Pack) Flatrate45_99 on-the-go useOur Tier1 13 x 21 1 2 x 1 Air Filter MERV 11 comes in a 6 Pack. These pleated high capacity filters are constructed using electrostatically charged filter media. This 100% synthetic material offers significantly higher particulate efficiency than typical poly cotton media pleated filters, and captures the smallest and most troublesome airborne particles and allergens, such as particles that carry viruses and bacteria, pollen, mold spores, fine dust