Ventilation device

The utility model relates to a chemical product processing ventilation device, in particular to a ventilation device which comprises a ventilation box, two fans are installed on the left side face and the right side face of the inner wall of the ventilation box respectively, and two partition plates a are fixedly connected to the left side face and the right side face of the inner wall of the ventilation box respectively. The opposite faces of the two partition plates a are slidably connected with the left side face and the right side face of the partition plate b correspondingly, a servo motor b drives a screw rod to rotate, the screw rod rotates to drive threaded sleeves to move downwards, the two threaded sleeves move downwards to drive a mounting plate and two air filter boxes to move downwards, and the air filter boxes are discharged through an access opening. The two air filter boxes are separated from the partition plate b, the air filter boxes and activated carbon filter materials in the air filter bo