Many homes require open heating ducts to transfer and moderate airflow. For older homes missing the cast iron Grilles and Registers or new construction with a traditional style, these pieces are made of the same materials as the originals. Choose the open Grille, for a constant flow, or the Register, which is backed with louvers that can be opened and closed. Both are made from cast iron and finished in Matte Black. SECURE COVER FOR HEATING VENTS: Openwork decorative grilles provide secure covering for heating vent openings FITS ANY ENVIRONMENT: For new construction or older home retro-fitting, requires 10'' x 12'' opening INCLUDED PARTS: Includes grill and louver assembly with foot control for opening and closing DIMENSIONS: Measures 12''L x 14''H, with mounting holes in each corner of the outer flange, made of cast iron with a matte black finish WARRANTY INCLUDED: All items have a 90-day manufacturer's warranty