25x25x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 24.75 x 24.75) - 3 Pack #REF! Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 8" duct openings

featuring a 8" round duct opening

+ Product Details Size – 12" x 20" or 20" x 12" is the size for the duct opening measurement only

very easy to do

+ Product Details Size & Compatibilty - The 10" to 8" round metal pipe reducer & increaser 30 gauge is compatible with duct 10" to 8"

25x25x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 24.75 x 24.75) - 3 Pack #REF! Ideal for Walls & Ceilings:+ Product Details 25" x 25" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 24. 75" x 24. 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