Many, if not most modellers use airbrushes, but even if you don't, we all use paints and glues that can generate strong and often toxic fumes. If these vapours and paint dusts are allowed to build up in a work room they can affect your health, so it's important to ventilate the work area in an effective manner. Opening a window is a good start, having a cross flow of fresh air is better, but the best method to breathe easy when modelling is to have an effective extractor that actively draws away the fumes and paint overspray. Years ago at TMMI, we used an improvised system that consisted of an old domestic extractor fan. two cardboard boxes and a length of tumble dryer exhaust hosing - this did the job but the fan was not isolated from combustible vapours, so a fire could possibly have resulted, obviously making this system not such a good idea.
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