3. a measurement of the amount of dust inside the building after installation the quantity of dust control system in each system to compare the quantity of dust before and after installation of the system.
Three. Measure the amount of dust inside the building after the dust control system installed on each system. To compare the amount of dust Pre-and post-install system.
3. Quantity of dust inside the building after the installation of dust control system in each system. To compare the amount of dust. Before and after the installation of such system.