Separator for precipitating particulate from an airflow

A separator for the removal of particulate from an airflow carrying different density particles, said separator comprising,

• fixed wall structure including contiguous walls partially defining an upright chamber through which the airflow passes,
• airflow inlet and outlet means in direct communication with said chamber,
• means inducing an airflow through said inlet and outlet means and said chamber,
• collector means disposed below said fixed wall structure,
• movable wall means disposed upright within said fixed wall structure and additionally defining said chamber, said movable wall means at all times offset from and extending substantially parallel to an opposed wall of the fixed wall structure,
• said inlet means being an air duct located normal to and offset from said movable wall means and discharging the airflow in a direction so as to cause impingement of the airflow against said wall means to initiate particle separation from the airflow, and
• adjustable means coupled to said wall means enabling positioning and retaining same relative the oppositely disposed wall so as to permit altering the crossectional area of said chamber and hence the velocity of the airflow passing upwardly therethrough to thereby control the precipitation of heavier density particulate from the chamber airflow.