Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 8" Collar w18h18 while the ingenious dial-controlled damper

while the ingenious dial-controlled damper empowers you to effortlessly regulate airflow using your foot

actual front end outer dimensions are approximately 22 5/8" width X 34 5/8" height -

75" width X 26

Actual Filter Size – 23 3/4"w x 31 3/4" x 1"

thanks to counter-sunk screw holes and included screws

Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 8" Collar w18h18 while the ingenious dial-controlled damper+ 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