Case of 12 of Glasfloss ZL 14x24x1 MERV 13 (FPR 10) Air Filters for AC and Furnace. ● Actual Size: 13-1/2 x 23-1/2 x 7/8 | Nominal Size: 14x24x1 ● Filtration Rating: MERV 13. Comparable to MPR rating 1900 to 2200, or FPR 10 rating. ● Incorporates 100% synthetic fibers which are electrostatically charged, thermally bonded and are manufactured in an engineered gradient structure. The engineered grading structure media supports high dust-holding capacity and long filter service life. ● Made in the USA. Ideal for residential, commercial, schools, apartments, business, & industrial filtration applications. ● For premium performance, the 1" inch depth Glasfloss ZL MERV 13 air filter can be used in HHVAC systems where better indoor air quality is required such as commercial and residential properties, school systems, government institutions, apartments, business and industrial applications. The MERV 13 filter features the latest in media technology to achieve MERV 13 while maintaining low pressure drop and long service life. The efficiency rating meets the air filtration efficiency criteria required to earn points toward certification in the Leadership in Energy and Environmental Design (LEED) Green Building Rating System. Glasfloss Z-Line Series MERV 13 filter media is laminated to a heavy-duty, galvanized, rust-resistant metal backing that stabilizes the media during operation. The pleats are formed in a radial configuration to ensure proper particle-loading.