Figure 1.

Photo of the personal protective ventilation hood*

* Air flows from the left hand side (lower body) to the rear of the hood to a fan and a high efficiency particulate air (HEPA) filter at the rear (right hand side). Location: clean room at the Department of Mechanical Engineering, University of Melbourne. Jason Monty (pictured) has given consent for this photo to be published. Aspects of the pram hood's development are found at https://www.youtube.com/watch?v=McQGJpEIqGk&feature=youtu.be