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The COSHH regulations require employers to operate and maintain Local Exhaust Ventilation (LEV) plant in an efficient state, efficient working order, good repair and in a clean condition.

An initial COSHH assessment should be performed on LEV plant, to ascertain the level of hazard and amount of airborne contamination. This will determine whether the LEV is sufficient and provides a benchmark for future thorough examinations.

The local exhaust ventilation regulations (COSHH reg 9) then stipulate 14 monthly, 6 monthly or monthly examinations and testing by a competent person.