Abstract: Adjustable blanking panels for use with equipment racks and enclosures to cover or fill in vacant sections of the rack or enclosure, to prevent the circular flow and reentry of high temperature air into the intake of electrical and computer equipment. The adjustable blanking panels include a generally rectangular base frame that defines opposing left and right side channels, and a generally rectangular shield that is adapted to be inserted into the side channels and slide relative to the base frame, to adjust the height of the panel to the size of the vacant section. The adjustable blanking panel may further include a lip that may be used to raise or lower the shield.