US Patent 10455744 Extendible barrier

Provided are blanking panels and methods of use for preventing the exchange of cold and hot air in an electronics rack having at least one module. The blanking panels comprise a face having a top edge and an oppositely positioned bottom edge; a first planar member extending transversely from the top or bottom edge; and a second planar member that is slidably engaged with the first planar member. The second planar member is configured for parallel movement relative to the first planar member. Further, the first and second planar members are configured to prevent airflow from a superior side of the blanking panel to an inferior side of the blanking panel. Methods of making and use are further provided.