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

but still very thin

Actual Filter Size – 23 3/4"w x 15 3/4" x 1"

Dimensions With Outer End are 7

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

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