What is Power draw in watts?

Power in watts is how much electricity an appliance draws while it runs. A purifier that pulls more watts moves more air but adds to the electricity bill, so the figure is worth reading against the size of the room and how long you run it. Brands state these numbers on their own sites. Alen Air Purifiers draws 1.36 to 55 across its range, Blueair sits at 3.5 to 42, and Air Health at 10 to 50.