The Clark pneumatic venturi air movers have no moving parts and simply require a supply of clean dry compressed air. Primary air enters the rear manifold and is released through the centre. Secondary air is drawn into the centre and mixes with the primary air stream and exits through the front at a higher velocity. The Clark Venturi units are suitable for use in underground coal mines. The units are constructed of steel and FRAS PU. Applications include ventilation and dust extraction of gaseous and dusty areas in coal mines, sewers and construction areas.