Powered Air Purifying Respirator Papr for Welding The KL99-PAPR is a battery-powered fan that together with a filter and an approved head top, is included in the fan-assisted respiratory protective device systems. This applies particularly to work that is hard, warm or of long duration. The human interface may consist of a hood, face shield, half mask or full face mask. The fan is equipped with a filter, and the filtered air is fed through a hose to the human interface. The
