24"W X 26"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 25.75"W X 27.75"H] Supply Grille This grille is ideal for RFGF1212 Rigid Design Noise Free Oval to Round 90-Degree Boot

This grille is ideal for both sidewall and ceiling installations

+ Product Details Size - 20"w X 2"h is the size for the duct opening measurement only

please note that the total outer dimensions of the grille measure 8" in diameter

For example

with actual outer dimensions of 14

24"W X 26"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 25.75"W X 27.75"H] Supply Grille This grille is ideal for RFGF1212 Rigid Design Noise Free Oval to Round 90 Degree Boot This grille is ideal for both sidewall and ceiling installations + Product Details Size 20"w X 2"h is the size for the duct opening measurement only