Just having a little nosey around the forum there and was reading the "fridgies van explodes" thread. Where does the law stand in the UK about ventilation in vehicles carrying gasses?. I currently have a transit van carrying refrigerants, mapp gas, and the little superfire brazing kit, and a bottle of R1270, with a sticker applied to the back door saying "Caution this vehicle has no ventilation open with care". Should this by law have roof and floor ventilation?.