24" x 24" T-Bar Drop Ceiling Perforated Return Grill - Metal Back Casing - With 14" Collar Powder-Coat All of these grills have

All of these grills have dampers

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+ Product Details Size – 6" x 16" or 16" x 6" is the size for the duct opening measurement only

featuring a 6" round duct opening

24" x 24" T-Bar Drop Ceiling Perforated Return Grill - Metal Back Casing - With 14" Collar Powder-Coat All of these grills have+ Product Details Size 24" x 24" with 14" collar T Bar drop ceiling perforated return grill metal back casing High Quality High quality rust free, strong aluminum construction with smooth finished edges for easy and safe use; Filter grille features a user friendly plastic latch that requires no screwdriver for opening. Installation Easy drop ceiling installation. Design Heavier gauge than needed, built for durability and long life in mind, but still