Essentially, automatic closed loop flow control ensures that the extraction rate remains constant. It does this by slowly increasing the speed of the blower as the filter begins to block, this overcomes the resistance to airflow through the filter and keeps the extraction rate constant.

This function is important because a falling extraction rate can cause problems. For example:

• Particles can adhere to laser lenses causing expensive damage

• The temperature profile on soldering ovens can be affected 

• People may inhale dust and fumes which escape due to weak extraction 

• Products can become contaminated with dust 

• Conveyors or equipment may need to be cleaned more often to prevent breakdown

Another benefit of flow control is extended filter life which means lower costs and less downtime for filter changes.