Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 3 Coned - 24" x 24" - For 6" Vent Connection Material_Aluminum actual front end outer dimensions

actual front end outer dimensions are approximately 18 5/8" width X 27 5/8" height

+ Product Details Size - 40"w X 6"h is the size for the duct opening measurement only

box or other attachments needed

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Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 3 Coned - 24" x 24" - For 6" Vent Connection Material_Aluminum actual front end outer dimensions+ Product Details Size 24"w X 24"h. These are specially sized to fit into all drop ceilings, 24"x 24", also called T Bar systems. Can be hooked up with our "Butterfly Dampers" for precise airflow control. For 6" Round Duct Opening Spiral or Flex Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was just waxed Heavy Gauge Steel Heavier gauge than needed, built for durability and long life in mind, but still very thin