Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 8" Collar Return Actual Filter Size – 17

Actual Filter Size – 17 3/4"w x 25 3/4" x 1"

allow you to customize airflow direction with ease

+ Product Details Size – 22"w X 12"h is the size for the duct opening measurement only

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from 4" to 20"

Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 8" Collar Return Actual Filter Size – 17+ Product Details Size 12"w X 12"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 8" 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