1.high efficient in the collection of smoke 2.the dust-proof efficiency up to 99.8% 3.easy to maintain, using plug-in installe CDR oil mist filter 1, high efficient in the collection of smoke, the dust-proof efficiency up to 99.82, easy to maintain, using plug-in installed 3, low noise during operation, less than 68 db (A) 4, safe and reliable operation, have functions of default phase and ...