To get rid of the soldering fumes, I re-purposed one of the fans I salvaged from an old office printer:
The fan is hot-glued into a card-board tube which also allows easy positioning of the fume extractor. The flexible tube attached to the end is long enough to reach out of the next window, so no fume filtering is needed.
This makes soldering way more comfortable, and during winter I can fill the window gaps around the exhaust tube with pillows. Smoke-free soldering without freezing! 😀