Aluminum Fixed Bar Return Air Filter Grille with Plenum Box - 24 x 24 T-Bar Lay-in Drop Ceiling 18" Diameter + Product Details Size –

+ Product Details Size – 20" x 32" or 32" x 20" is the size for the duct opening measurement only

+ Product Details Outer dimensions: – fits a duct opening

6"w X 6"h 3-Way Fixed Curved Blade Air Supply Diffuser - Vent Duct Cover - Grille Register - Sidewall or Cieling - High Airflow - White

+ Product Details Size – 34"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 34"h X 2"d (for duct opening measurement only)

Aluminum Fixed Bar Return Air Filter Grille with Plenum Box - 24 x 24 T-Bar Lay-in Drop Ceiling 18" Diameter + Product Details Size –Pre scored Outlines per Diameters from 6" 18" Outer Dimensions 23. 75" x 23. 75" Plenum Box Depth 5. 25" Plenum Size 20x20 Filter Size to be used: 20x20x1 For Lay In T Bar Ceiling High Quality Aluminum Construction 2 3" bar spacing Horizontal bars are fixed at 45 degrees for Great Airflow Dynamics 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