The design concept of TX2 series three in one dustproof mesh cover is mainly simple and practical, and achieve thepurpose of high guality and favorable price. The material of the ventilation network body is flame-resistant ABS resin, ancthe material of filter, mesh is nylon fiber reinforced synthetic resin. The pressure loss of the filtermesh is 6.9mmA0 in theinitial,stage and 24mmAQ in the final stage, with a maximum wind speed of 2.0m/sec. The operating temperature rangeis -10°C -55 c , and the effective wind speed is 50m3/min, The dust removal rate is up to 89%, and the protection level carreach P40.