Many of the carts in this part of the world have hoods. They are important in areas where there are a lot of vendors, and the quantity of smoke can be very annoying at street level if there is not some sort of hood and vent. The very mobile guys use a 12 volt auto radiator fan in them. They work out quite well, the chimneys aren't that high, but enough to get the smoke above walking height. I'm sure this is absolutely no help with regards to your dealing with the health gestapo but they do serve a purpose.
There some very good advice above, anytime you get someone in authority telling you something, ask them to give you the section paragraph, etc of the code that refers to this regulation. That's your starting point to challenge them.
post edited by RodBangkok - 2013/06/30 05:23:25