My project is improve performance of bag filter . packer has a many dust. cause worker are not convenient of the work. I measure pressure around a pipe by manometer. The result show that the velocity is very low. Cause the flow rate is very low as well. And then I calculate pressure loss in system compare a suction force of system. The result show that pressure loss of system is higher than suction force. Which is why the wind does not flow. I offer to scg should be scaled to larger diameter pipe and reduce filter