Product Information:Hart and Cooley FPD3 Steel TBar Fixed Pattern Diffuser is constructed of steel square three cone core face and comes with a 12" fixed collar. Its 360degree air diffusion provides high air volume delivery while the unique 2 inch high collar permits easy flex connections. Utilizing a butterfly damper, it is adjustable through the face. The FPD3 Diffuser features a bright white finish that is designed and manufactured to the highest performance standards, while delivering exceptional value, aesthetic appeal, and consistent performance. Features:#149; Steel construction#149; Provides high air volume delivery#149; 360degree air diffusion#149; Three cone fixed core#149; Fixed collar 12 inch#149; Unique 2 inch high collar permits easy flex connections#149; Utilizes butterfly damper (3800 Series) inserted in collar (NOT Included)#149; Damper adjustable thru face#149; Formed steel back panel#149; Bright White finish Specifications:#149; Model Number: FPD3 12 W#149; Part Number: 050512#149; Color: Bright White#149; Fixed Collar: 12"#149; Overall Dimensions: 233/4" H x 233/4" W#149; Depth: 41/2"