Posted By Keith Higgs I claim to know nothing about the equipment you describe but the COSHH ACoP does mention portable LEV under the heading "Local exhaust ventilation (LEV) plant" (para 64 of the 1999 ACoP). There is no definition for 'plant' but I can only assume that your drylining LEV would be included. I would imagine that an inspection period of 14 months in such an environment would be rather long. However, it should be relatively easy to detect if the LEV was malfunctioning as the dust is very visible (unlike fume cupboards and safety cabinets in my line of work). Filter type and condition would be prime candiates for inspection. I would be interested to know if inspections do take place for such equipment in the construction industry.

Posted By Stuart Nagle By comparrison, vacuuming (shadow vacuuming) is employed in taking asbestos samples, employing a type'H' (hazardous dust) vacumm cleaner. The situation here is that the contents of the vacuum, obviously hazardous, as well as the cleansing/replacement of the bag, vacuum cleaner internal parts, secondry filter and HEPA filter need to be carried out by a trained and competent person. On enquiry with the manufacturer, prior to purchase of this equipment, I was informed that testing and certification of the vacuum needed to be carried out regularly - at least 6 monthly, or as stated by the manufacturer in accordance with HSE advice they received, after 800 to 1000 hours use. In the case of fine particulate dust, including silica one assumes, in plaster dust, has an assessment of risk been done in respect of the vacuuming operation to ensure that the harmful particulates are removed from 'recycled' air and what if anything needs to be done to empty the vacuum safely and clean and secure new bags and filters ect in the equipment. Is the dust actually harmfull in this context, e.g. being vacuumed (through a filter) and does it need any special precautions (over and above perhaps a dust mask and eye protection etc) to be taken. Whilst in theory it does represent LEV with the emphysis being on 'Local' what about other vacumming tasks in the workplace and how far down this road does or should LEV go in respect of vacuum cleaners !! An interesting if somewhat nerdish study subject for someone me thinks... Stuart Nagle