Actual Size: 23-3/8 x 23-3/8 x 3-3/4, Nominal Size: 24x24x4. Effectively captures and blocks small particles such as dust, smog, lint, pet dander, dust mites, pollen, and other small air particles. Manufactured in the USA. Improve indoor air Standard and extend the service life of your HVAC system by replacing air filters regularly.
