An assembly to contain energy from arc flash within a mounting slot of an equipment rack includes a valve panel assembly including a first valve panel body secured to the frame members by a first hinge and a second valve panel body secured to the frame members by a second hinge. The first valve panel body and the second valve panel body are configured to rotate between closed positions and open positions. A method of assembling a system to contain energy from arc flash within a mounting slot of an equipment rack is further disclosed.