18 x 12 Merv 2 HVAC Pleated Filter, 12-Pack Sheet Metal/Adjustable Elbow + Product Details Size -

+ Product Details Size - 28"w X 36"h X 2"d (for duct opening measurement only)

+ Product Details Size - 12"W X 8"H is (for duct opening measurement only)

+ Product Details Size – 8" round duct sheet metal elbow - 30 gauge galvanized - crimped end connection - adjustable from 5° - 90°

+ Product Details Size – 6"w X 14"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 20" OR 20" x 30" duct opening (measured at the opening)

18 x 12 Merv 2 HVAC Pleated Filter, 12-Pack Sheet Metal/Adjustable Elbow + Product Details Size -+ Product Details Size 18"w X 12"h pleated MERV 2 filter for HVAC return filter grille 12 Pack. Actual dimensions: 17. 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