Here (Italy) there is a safety norm originally dating back to 1974 that (though a lot more complicated than this) essentially makes in any kitchen (with a gas s

Here (Italy) there is a safety norm originally dating back to 1974 that (though a lot more complicated than this) essentially makes in any kitchen (with a gas stove) compulsory two connections (of a given size, 100 cm2, in practice a 12 cm pipe) with the outside, one at a low level for intake and one (usually it is the kitchen vent, but it could be another opening) for exhaust at a higher level (I seem to remember above 1.80 or 2.00 meters). It has to be underlined how - in practice - the actual need for such provisions was at the time perhaps a little exaggerated (as windows were usually leaky) but with the increasing use of air-tight windows (but not usually mechanical ventilation of the house) the intake and exhaust are actually needed.