Centralized. Centralized ventilation dust removal system is a number of dust-producing points the whole workshop even the whole plant dust-producing points are all concentrated into a system, set up a special dust room, managed by a person in charge. This system has a large air volume, easy to centralize the management, dust post-processing is relatively easy, but the pipeline is long complex, the resistance is easy to balance, the air volume adjustment is difficult. It is suitable for dust-producing equipment is more centralized have the conditions to set up dust removal room occasions, such as refractory factory. For multi-storey plant with many dust-producing points, the top floor can be used as a dust room, the dust-producing points on each floor are connected to the top dust collector, which is purified then discharged into the atmosphere.