Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?
Taking smells out where they are made, before they reach the rest of the house. Cooking and the bathroom are the two sources, and both are easier to deal with at the source than after the fact. The options differ in whether the air is pulled out by a fan or leaves on its own.