The Control of Substances Hazardous to Health Regulations 2002 No. 2677

Regulation 9(2)(a)

SCHEDULE 4 FREQUENCY OF THOROUGH EXAMINATION AND TEST OF LOCAL EXHAUST VENTILATION PLANT USED IN CERTAIN PROCESSES

Column 1	Column 2
Process	Minimum frequency
Processes in which blasting is carried out in or incidental to the cleaning of metal castings, in connection with their manufacture.	1 month
Processes, other than wet processes, in which metal articles (other than of gold, platinum or iridium) are ground, abraded or polished using mechanical power, in any room for more than 12 hours in any week.	6 months
Processes giving off dust or fume in which non-ferrous metal castings are produced.	6 months
Jute cloth manufacture.	1 month