Improve the air quality in your home with this Pre Pleat 40 MERV 8 Air Filter. An industrial grade, disposable pleated filter, its synthetic-fiber filtering medium is laminated to an expanded metal backing. Then it's folded into an accordion pleat configuration to increase the filtering surface. This allows for superior filtration while keeping low airflow resistance. A die-cut, moisture-resistant frame houses the media pack. The filter has a MERV 8 performance level.