Arrestall AR-20 is a compact, self-contained fabric dust collector. Each unit consist of a flat bottom, unitized housing, internal fan and motor, built-in silencing, removable filter, manual shaker, and dust bin.

Dust laden air enters the unit through a lower inlet located left, right or rear. the air is then directed upward, causing separation and deposition of the larger, heavier dust particles directly into the dust bin. This greatly reduces the dust load to the filter envelope. The finer dust particles are collected on the surface of the filter as the air passes through. The air then flows into the fan, and is exhausted into a built-in silencing chamber and out of the top of the unit.

Collected dust is discharged from the surface of the filter pocket by a manual, cam actuated arm assembly, which is located on the side of the unit. Unit ships fully assembled.