Bag-house filter systems are used to extract airborne wood dust particles from the air in the workplace environment. Dust laden air enters through the bag-house filters entry inlet. This incoming air strikes the filter bags, causing the heavier material to fall to a bottom hopper. The air with the lighter and smaller materials is filtered by the filter bags and clean air is exhausted to atmosphere.

The collected dust material is discharged from the bag-house filters through a rotary air lock to be collected in the residual collecting conveyor system. Air is pulsed through jets into the interior of the filter bags. This action causes the bags to ripple, knocking off the "cake" from the outside of the filters. This material is also discharged to the residual collecting conveyor system through a rotary air lock.