36"W X 18"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 37.875"W X 19.875"H] Powder-Coat + Product Details Perfect Fit CRFG2028 Width_14in 4 X 12 Is

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 6" OR 6" x 20" duct opening (measured at the opening)

Actual Filter Size – 33 3/4"w x 23 3/4" x 1"

Constructed from sturdy 20-gauge steel

32" x 8" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply

or office environments

36"W X 18"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 37.875"W X 19.875"H] Powder Coat + Product Details Perfect Fit CRFG2028 Width_14in 4 X 12 Is + Product Details Perfect Fit & Easy Sizing Designed for a 20" x 6" OR 6" x 20" duct opening (measured at the opening) Actual Filter Size – 33 3 4"w x 23 3 4" x 1"