Ventilation opening convenient to install for elevator

The ventilation opening comprises an outer frame, a flow deflector is arranged in the middle of the bottom face of the outer frame, the flow deflector is in an inclined state, installation plates are arranged on the inner walls of the two ends of the outer frame, installation bins are arranged between the installation plates and the outer frame, and the installation bins are arranged on the outer frame. And two pressurizing sliding blocks are movably arranged on the inner side of the mounting bin, an adjusting screw rod is arranged between the two pressurizing sliding blocks in a penetrating mode, a sliding limiting clamping groove is formed in the outer surface of the bottom end of the adjusting screw rod, and the bottom end of the adjusting screw rod penetrates through the outer frame and is provided with an adjusting rotary knob. By arranging the outer frame, the flow deflectors, the adjusting knobs, the adjusting screw rods, the pressurizing sliding blocks, the pressurizing connecting rods and the pressur