Ventilation device with secure structure

The invention relates to a ventilation device with a secure structure, which consists of a wrap angle and end face plates, wherein the wrap angle has a prismatic structure, and is arranged on the outer lateral surface of the ventilation device; the cross section of the wrap angle has an inverted isosceles trapezoid shape, and the left and right sides of an upper bottom edge have an annular structure respectively; and the end face plates are arranged in the front and rear lateral surfaces of the wrap angle. Compared with the prior art, the ventilation device has the advantages that: the transverse arrangement of the end face plates at the front and rear ends of a conventional ventilator is changed into longitudinal arrangement, so the overall span range of the end face plates is relatively narrower, and the end face plates are convenient to arrange; moreover, each end face plate can be fixed on the outside wrap angle at a plurality of points, so the structure is securer; in addition, the end face plates are longitudinally arranged, so the end face plates have attractive appearance, dust is difficult to deposit, the maintenance workload is reduced and the cost is saved.