Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 6" Collar Insulated Line + Product Details Size -

+ Product Details Size - 22"w X 20"h is the size for the duct opening measurement only

With plain ends

actual front end outer dimensions are approximately 33

actual front end outer dimensions are approximately 36 5/8" width X 28 5/8" height

and with a built-in back 1/2" mesh they also protect you from annoying rodents like mice

Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 6" Collar Insulated Line + Product Details Size -+ 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 6" Round Duct Opening Spiral or Flex High Quality No sharp surface edges. Just run your finger along the edge of the top plate and youll find a smooth finished surface. Installation Location Ceiling. Design Easy unrestricted air flow for your