Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 6" Collar White + Product Description Enhance your

+ Product Description Enhance your HVAC system with our Aluminum Return Filter Linear Bar Grille

+ Product Details Size - 4"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 24"w X 12"h is the size for the duct opening measurement only

Crafted from high-quality aluminum

Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 6" Collar White + Product Description Enhance your+ 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