I've bought a few gas things, and by a few I mean basically everything! (stove, lantern, heater...)
I've read about the dangers of using gas powered appliances in poorly ventilated tents and I understand that completely.
So how much ventilation is needed? I'm looking to get an icarus 500 and those have the side and front doors... If I were to cook in the living area with both doors fully open or have the heater pointing towards us whilst we sat in the living area but have both doors open... would that be enough? Like wise with the lantern...
Remember that any doggey gasses will be at the bottom of the tent at the same height as your head when you go to bed, so make sure you have ventilation low down as well as higher up!