18x24x1 MERV 13 Pleated Air Filter 6PK - 17.375x23.375x.75 - Actual Size UV Bulbs 10x20x1 MERV 8 filters are

10x20x1 MERV 8 filters are a considerably better choice for healthier air

Hydronix SPC-45-2050 50 Micron Pleated Polyester Sediment Filter 4

Dimensions: 2 2/3" x 20"

Grooved for increased surface area

Body Material: Type 303 stainless steel or brass

18x24x1 MERV 13 Pleated Air Filter 6PK - 17.375x23.375x.75 - Actual Size UV Bulbs 10x20x1 MERV 8 filters are18x24x1 MERV 13 Air Filter Box of 6 Actual Size of Filter: 17 3 8 x 23 3 8 x Air filters are ranked in a minimum efficiency rating value (MERV) system. The higher the MERV rating, the better the filter can filter out all airborne particulates. Since we are constantly trying to improve indoor air quality, it only makes sense that we would offer air conditioner filter MERV 13. 18x24x1 MERV 13 filters are right on the cusp of being classified as medium