32"W X 4"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 33.75"W X 5.75"H] w36h36 + Product Details Size - Suitable for all AC 8in diameter 12125SDCLNGBX

+ Product Details Size - 20"w X 18"h is the size for the duct opening measurement only

Energy Efficient – Air-tight inner core decreases the pressure loss and provides a more hygienic environment - high energy efficient / No fiberglass erosion into air stream

5" - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE

box-shadow: 0 4px 8px rgba(0

32"W X 4"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 33.75"W X 5.75"H] w36h36 + Product Details Size Suitable for all AC 8in diameter 12125SDCLNGBX + Product Details Size 20"w X 18"h is the size for the duct opening measurement only Energy Efficient – Air tight inner core decreases the pressure loss and provides a more hygienic environment high energy efficient No fiberglass erosion into air stream