20" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Insulated Line Set 75" Height - SEE BELOW Suitable for all AC 8in diameter 12125SDCLNGBX

75" Height - SEE BELOW IN DESCRIPTION How To Measure A Grille

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening)

+ Product Details Size – 24"w X 10"h is the size for the duct opening measurement only

Put in frame and lock the door into place

20" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER EASY AIRFLOW LINEAR BAR GRILLES Insulated Line Set 75" Height SEE BELOW Suitable for all AC 8in diameter 12125SDCLNGBX 75" Height SEE BELOW IN DESCRIPTION How To Measure A Grille + Product Details Perfect Fit & Easy Sizing Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening)