Plymovent MNF Spare Parts FAQs
Straight answers to the questions people ask most when choosing and fitting spare parts for mobile extraction fan units.
How do I identify the correct spare part for my extraction unit?
Check the data plate for the unit type and electrical details, and use the manual or parts diagram. Note the voltage, frequency and number of phases, because motors and switches are made for specific supplies.
Photographs of the unit, its plate and the old part help our team match the right spare.
What is a motor protection switch and why would I replace one?
A motor protection switch combines a manual on-off switch with overload protection for the motor. It trips if the motor draws too much current, protecting it from damage.
If the switch is faulty, damaged or keeps tripping for no reason, it may need replacing. A tripping switch can also point to a motor, wiring or blockage fault, so investigate the cause first.
How do I choose a replacement motor?
Match power, voltage, phases, frequency and mounting to the original. A single-phase motor cannot replace a three-phase one directly, and a different power rating changes the airflow and load on the fan.
Check the data plate on the old motor. Fit the sealing parts supplied, and have the electrical work carried out by a competent person.
Why must motor and fan parts match my supply frequency?
Motor speed, and so airflow and motor loading, depends on the supply frequency. Motors and fan parts are often made in versions for 50 Hz or 60 Hz supplies, and UK mains is 50 Hz.
Using a part made for a different frequency can change performance and put extra load on the motor. Check the frequency on the data plate of your own unit and its motor, and make sure any replacement is marked for the same supply before you order or fit it.