Yeah. I chucked a bit of polystyrene at it, but I'll have to do it properly at the weekend. I've also stuck the filter on the extract, should slow the air flow a tad which will help (for some reason, it's always been slightly negative pressure, so it will suck a bit of cold air in from around the tent, the filter is enough to tip it to positive pressure).
Itisi
it is isn't it?