The SRXUPANEL Blanking Panel Kit fills unused spaces in your standard 19-inch rack. Not only does this give your rack a sleek, clean look, but it also protects your valuable rack equipment by improving airflow and cooling efficiency. By closing off unused rack openings, these blanking panels prevent hot air from recirculating through open spaces. This reduces operating costs, improves performance and provides longer lifespans for your equipment. Constructed from heavy-duty cold-rolled steel in a durable black powder-coat finish to match most rack enclosures, the SRXUPANEL includes four blanking panels in different sizes: 1U, 2U, 4U and 8U. This gives you the flexibility to close off up to 15U in rack space in different configurations as needed. Just attach the desired panels to the rack's front vertical mounting rails using the included hardware.