-1 if the system is powerful enough to control the quantity of dust inside the building, there is no need to install another system to help save the expense of the company.
- If the first system that is powerful enough to control the amount of dust in the building. I do not need to install other systems. To help save money for the company.
- if the system 1 powerful enough to control the amount of dust inside the building. There's no need to install another system. To help save the expense of the company.