Plymovent Control Equipment FAQs
Straight answers to the questions people ask most about controls for welding fume extraction systems.
What does fume extraction control equipment actually do?
Control equipment switches extraction fans and dampers on and off, and can adjust the airflow to match what is happening in the workshop. Instead of a fan running at full power all day, it runs only when and where extraction is needed.
This cuts wasted energy, reduces noise and wear, and keeps heated air in the building rather than blowing it outside. It ranges from simple manual switches to fully automatic systems.
Can I run several extraction points from one fan?
Yes, in a central system, dampers open and close so air goes only to the points in use. A control unit manages the dampers and the fan speed or switching so the airflow stays suitable.
The duct design, fan size and controls all have to be matched. An incorrect design can leave some points with weak airflow, so involve a competent installer for the layout.
What does a frequency inverter or variable speed drive do?
It adjusts the speed of the fan motor, so the fan gives just the airflow the system needs. When fewer extraction points are in use, the fan slows down and uses less power.
A drive can also start the motor gradually, which is gentler on it than starting at full speed. It must be correctly sized and set up for the motor, and wired by a competent electrician. Check the data plate and manual for your own motor and fan before choosing one.
Do I need a different control box for different voltages and phases?
Yes. Control equipment is built for specific supply voltages and for single-phase or three-phase supply, and for a range of motor sizes. Using the wrong one can damage the equipment or be unsafe.
Check the data plate on your fan motor, the supply at the site and the ratings of the control box. If you are unsure, have an electrician or the supplier confirm compatibility before you buy.