Metering and pricing device for business expansion installation

The metering and pricing device comprises a box body, the inner bottom wall of the box body is fixedly connected with a bottom plate, the upper surface of the bottom plate is fixedly connected with metering and pricing equipment elements, the left side face and the right side face of the box body are each provided with a ventilation opening, each ventilation opening is internally provided with a filter screen, and the filter screens are arranged on the left side face and the right side face of the box body. The outer surface of each filter screen is fixedly connected with the inner wall of each ventilation opening, the inner wall of the box body is fixedly connected with a carrier plate, the bottom surface of the carrier plate is fixedly connected with symmetrical air guide blocks, the side faces, away from each other, of the two air guide blocks are fixedly connected with the inner side wall of the box body, two through openings are formed in the bottom surface of the carrier plate, and the two air guide blo