Return Air Filter Grille with Plenum Box - 24 x 24 T-Bar Lay-in Drop Ceiling Sheet Metal + Product Details Size –

+ Product Details Size – 20"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 8"h Is The Size For The Duct Opening Only

When used together

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 30" OR 30" x 26" duct opening (measured at the opening)

Return Air Filter Grille with Plenum Box - 24 x 24 T-Bar Lay-in Drop Ceiling Sheet Metal + Product Details Size –For Lay In T Bar Ceiling High Quality Steel Construction Easy Unrestricted Air Flow For Your HVAC System 50 angled to provide maximum airflow 1 2" Spaced Stamped Louver Face Concealed Hinges and Latches to achieve a clean and modern look R6 Fiberglass Back Plenum accepts 6" to 18" Round Spin in Collars or Start Collars (not included) Accepts 1" disposable filter (not included) Recommended Size: 20x20x1 QUALITY PACKAGING & SATISFACTION GUARANTEED