Our Generic '18x25x1' air filters replacement are comparable to the Accumulair Diamond MERV 13 air filters for your air conditioner, HVAC or furnace. These are a perfect low cost alternative if you're looking for high quality grade filters. Built with MERV 13 electrostatic pleated media, these filters are comparable to any MERV 13 air filters out there. The air filter attracts particulates like dust to a TV screen. Each air filter lasts up to 90 days under normal conditions. Made in USA. Actual Size: 17.5 x 24.5 x .75

• Nominal Size: 18x25x1. Actual Size of Filter: 17.5' x 24.5' x 0.75'
• MERV 13 Rating. Each filter lasts up to 3 months.
• Each filter lasts up to 3 months.
• Electrostatically charged filter media captures airborne allergens smaller than 1 micron!