Sometimes when I'm running the extractor I may at the same time have the door to the living room open and the kitchen window open and running the living room wo

Sometimes when I'm running the extractor I may at the same time have the door to the living room open and the kitchen window open and running the living room wood stove at maximum - if I do, it sucks so much air from the room that the ventilator in the kitchen doesn't get a chance: The stove takes air via the kitchen window and goes straight past the ventilator even if at max, and into the living room. Where the detector sniffs enough to notice. A rare situation of course, but it has happened to me a handful of times over the years (and also the opposite - ventilator in kitchen running at max, kitchen window closed, living room wood stove going, the vent sucks smoke from the living room wood stove and the smoke detector goes off). As to the other comment - my ventilator doesn't have a carbon filter and I have little experience with those. I recon it will remedy some of the problems with re-venting back into the room compared with the alternative (using nothing). And I've seen vents in Japan with carbon filters, or at least something similar - but they vent outside, not inside. I wonder though about all the other kind of fumes from cooking, the metal-grid "filter" in my vent gets quite greasy and needs to be washed and cleaned now and then.