8"W X 30"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 9.75"W X 31.75"H] Insulated Line Set + Product Details Size - Width_20in These won t hinder RFG1620 FBA

+ Product Details Size - 10"w X 36"h is the size for the duct opening measurement only

line-height: 20px

+ Product Details Size - 20"w X 4"h is the size for the duct opening measurement only

Design – Rigid gauge built for durability and long life in mind

Design – Easy unrestricted airflow for your HVAC system - 50° angled to provide maximum airflow

8"W X 30"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 9.75"W X 31.75"H] Insulated Line Set + Product Details Size Width_20in These won t hinder RFG1620 FBA + Product Details Size 10"w X 36"h is the size for the duct opening measurement only line height: 20px