The two main types of garden vacuum available to buy are called ‘clean fan’
or ‘dirty fan’
systems and they each have their own benefits over the other.
Clean fan systems in a garden vacuum work by diverting the airflow generated by the motor, down a chute and into a collection bag. Any debris that is collected, is shredded or mulched by using shredding line connected to a rotating disc, located just before the collection bag.