28"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 29.75"W X 37.75"H] sidewall Insulation – A thick blanket 4" Round Duct Pipe Product Details Size The SHEASC10W1-HP

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

and slashes energy costs

+ Product Details Size - 22"w X 26"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 24" or 24" x 12" duct opening (measured at the opening)

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28"W X 36"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 29.75"W X 37.75"H] sidewall Insulation – A thick blanket 4" Round Duct Pipe Product Details Size The SHEASC10W1 HP Insulation – A thick blanket of fiberglass insulation provides you with an R Value of 4 and slashes energy costs