28"W X 16"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 29.75"W X 17.75"H] steel Insulation – A thick blanket 4 X 12 Is CRFG2028 Width_14in

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 8

+ Product Details Size - 12"w X 22"h is the size for the duct opening measurement only

Design – Removable face for cleaning and access to damper - wooden damper for airflow shutoff control

that will overlap at wall joint

+ Product Details Size - 30"w X 25"h is the size for the duct opening measurement only

28"W X 16"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 29.75"W X 17.75"H] steel Insulation – A thick blanket 4 X 12 Is CRFG2028 Width_14in Insulation – A thick blanket of fiberglass insulation provides you with an R Value of 8 + Product Details Size 12"w X 22"h is the size for the duct opening measurement only