Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 6" Collar Compatible with Duct 10" Actual Filter Size – 17

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

+ Product Details Size - 28"w X 10"h is the size for the duct opening measurement only

Actual Filter Size – 13 3/4"w x 33 3/4" x 1"

Actual Filter Size – 9 3/4"w x 9 3/4" x 1"

actual front end outer dimensions are approximately 14 5/8" width X 20 5/8" height

Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 6" Collar Compatible with Duct 10" 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 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