What hazard class is represented by a placard with a yellow background on the top half and a white background on the bottom half, featuring a black fan and the number 7?

The hazard class represented by a placard with a yellow background on the top half and a white background on the bottom half, featuring a black fan and the number 7, signifies radioactive materials. The number 7 is specifically assigned within the system of placarding to indicate radioactivity. The yellow color often reflects caution and danger, while the combination of the black fan symbol denotes the presence of radioactive substances.

In terms of emergency response and safety, recognizing this placard allows firefighters and first responders to approach the situation with the necessary precautions, understanding it deals with radiation hazards. The significance of this placard aids in the recognition of dangers associated with exposure to radioactive materials, ensuring proper protective measures and strategies are utilized during containment or evacuation efforts.