18x30x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 29.75) - 3 Pack Return Grille border-bottom: 1px solid #eee

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+ Product Details Size – 24"w X 30"h or 30" X 24" is the size for the duct opening measurement only

10" Diameter Is The Size For The Duct Opening Measurement Only

actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height -

18x30x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 29.75) - 3 Pack Return Grille border-bottom: 1px solid #eee+ Product Details 18" x 30" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 17. 75" x 29. 75") A unique combination of cotton & synthetic fibers gives you the most filtration and the least air resistance equals great air & easy airflow for your system. The non pleated design provides low airflow resistance while still effectively capturing dirt and particles such as standing dust, spray paint