The HDX Twin Window Fan from Home Depot, $32
A few months ago I wrote a post about how to ventilate a kitchen when you don't have a range hood or vent. A number of Kitchn readers recommended installing a reversible window fan which, when put on the exhaust setting, can effectively draw smells, steam, and smoke out of your kitchen.
I don't have a hood in my rental kitchen, and for a long time I just ran the ceiling fans in other rooms when I cooked something particularly smelly or smoky. It worked okay, but wasn't ideal. So I decided to put a window fan in one of my kitchen windows, and now I'm so glad I did.