Which is why [Adam Kelly] decided to design this DIY HEPA air purifier that ... mm computer case fan coupled with a step-up converter that can produce 12 V from a standard USB port.

Some of these 'fans' are among the best air purifiers and the best heaters, so there's plenty of choice. For example, our first pick in this guide, the Dyson Purifier Humidify+Cool Formaldehyde is ...

With hay fever season on the way, Dyson has given its most accessible air purifier, a seriously impressive upgrade. The new Dyson Purifier Cool PC1 (TP11) now has better filtration, projection and ...