12" x 20" Pleated MERV 8 Filter for HVAC Return Filter Grille [Actual Dimensions: 11.75 X 19.75] 3-Pack return grille + Product Details Size -

+ Product Details Size - 6"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 24"h X 2"d (for duct opening measurement only)

very easy to do

actual front end outer dimensions are approximately 20 5/8" width X 32 5/8" height -

Design – Circular air supply valves - designed to be used in low and medium pressure ventilation air conditioning systems

12" x 20" Pleated MERV 8 Filter for HVAC Return Filter Grille [Actual Dimensions: 11.75 X 19.75] 3-Pack return grille + Product Details Size -+ Product Details Size 12"w X 20"h pleated MERV 8 filter for HVAC return filter grille 3 Pack. Actual dimensions: 11. 75" X 19. 75" High Quality A uniquie combination of cotton & synthetic fibers gives you the most filtration and the least air resistance equals great air & easy airflow for your system Design The "W" shaped pleats give you more filter surface thereby capturing more dust. Our metal and paper diagonal support bars ensure the filter can