Thanks for all the advice guys and my apologies for the late reply. My condolences to Marc, I'm sorry to hear that news, it is a stark reminder of how serious these matters are. I've taken a lot of the advice given here, sorting better ventilation and air filtration measures, I must say I do feel a lot better for doing so, and at the same time I feel this improves my work by a significant amount, the healthier I feel the better able I am to do my work, even if some of the precautions take extra time to employ
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George
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