Q: I have a cheap range hood that is permanently stained and, as a bonus, it stinks. I want to replace it with a microwave oven/range hood combination, but I don’t see any ductwork in the cabinet ...

Sitting in an office, or in their own homes, many people don’t notice their building’s ductwork unless there is something wrong with it — it’s too noisy or the air in the room is too cold or too hot.