Whether you’re manufacturing widgets or treating wastewater, shutdowns are bad for business. And there’s nothing more frustrating than having to take an entire facility offline while you wait for replacement fan parts to show up.

Every fan needs periodic upkeep, especially if you work in an environment with dirty air. But when it comes to maintenance, some fans save you time and money; unfortunately, many others don’t.

Let’s say you run a food or paper processing business. Which of these choices would you pick every time you have to perform maintenance?