Figure 1. Components of Respiray Wear A+. 1 = Air is drawn into the device through the intake grille. 2 = Large particles are filtered using the pre-filter. 3 = The body of the device houses fans, battery, and electronics. 4 = The HEPA filter blocks allergens and allows only clean air to pass through. 5 = Clean air is blown out from the output grilles. 6 = The device is worn on the user’s chest using straps.