12x36x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 11.75 x 35.75) - 3 Pack 14" Diameter you will need a 14"

you will need a 14" x 20" filter

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12x36x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 11.75 x 35.75) - 3 Pack 14" Diameter you will need a 14"+ Product Details 12" x 36" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 11. 75" x 35. 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