2 Pack of 16x20x4 MERV 13 Pleated 4' Inch Air Filters by Glasfloss. Actual Size: 15-1/2 x 19-1/2 x 3-3/4 ● Filtration Rating: MERV 13. Comparable to 3M/Filtrete MPR rating 1900 to 2200, or FPR rating 10. ● Protects from pollen, dirt, dust, pet dander and virus carriers, smoke, smog, lead dust, oil smoke and micro allergens. ● Note: Does not replace 5' inch or 4-3/8' Depth filters. Please check actual filter size needed. ● The Glasfloss Z-Line Series MR-13 pleated air filter features the latest in media technology to achieve MERV 13 while maintaining low pressure drop and good service life. The new Z-Line Series MR-13 pleat is optimized for "LEED” compliance in new and existing buildings as well as providing a cost-effective upgrade from lower efficiency pleated filters for a variety of commercial and industrial applications. The Z-Line Series MR-13 pleat is available in many standard face dimensions in 1”, 2″ and 4″ depths.2 Pack of 16x20x4 MERV 13 Pleated 4' Inch Air Filters by Glasfloss. Actual Size: 15-1/2 x 19-1/2 x 3-3/4 ● Filtration Rating: MERV 13. Comparable to 3M/Filtrete MPR rating 1900 to 2200, or FPR rating 10. ● Protects from pollen, dirt, dust, pet dander and virus carriers, smoke, smog, lead dust, oil smoke and micro allergens. ● Note: Does not replace 5' inch or 4-3/8' Depth filters. Please check actual filter size needed.