12 x 12 Merv 2 HVAC Pleated Filter, 12-Pack 3" Round Duct Pipe If you are looking for

If you are looking for a top of the line unit to enhance your project

actual front end outer dimensions are approximately 12 5/8" width X 34 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 26" OR 26" x 18" duct opening (measured at the opening)

Size - 10"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – Stick-on collar is 5" and it is compatible with duct 5"

12 x 12 Merv 2 HVAC Pleated Filter, 12-Pack 3" Round Duct Pipe If you are looking for+ Product Details Size 12"w X 12"h pleated MERV 2 filter for HVAC return filter grille 12 Pack. Actual dimensions: 11. 75" X 11. 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 increase the surface area, effectively capturing dirt and particles such as pollen, dust mites, standing dust, spray paint