4"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 5.25"W x 5.25"H] Filter Grille + Product Details Size - RG2230 HP w4h4 const modal document

+ Product Details Size - 34"w X 20"h is the size for the duct opening measurement only

5" wider - SEE BELOW HOW TO MEASURE A GRILLE

+ Product Details Size - 12"w X 26"h X 2"d (for duct opening measurement only)

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+ Product Description Upgrade your HVAC system with our Premium Quality Straight Round Stack Boot

4"W X 4"H [Duct Opening] Linear Aluminum Clip On Bar Return Air Grille [Outer Dimensions: 5.25"W x 5.25"H] Filter Grille + Product Details Size RG2230 HP w4h4 const modal document + Product Details Size 34"w X 20"h is the size for the duct opening measurement only 5" wider SEE BELOW HOW TO MEASURE A GRILLE