The Draeger C420 is a Powered Air Purifying Respirator (PAPR) designed for use by emergency responders and law enforcement . The standard NIOSH-approved combination filter cartridges provide protection against nuclear, biological and chemical warfare agents. A PAPR provides a constant flow of filtered air to the user's facepiece, thus providing a higher safety factor due to a positive pressure in the mask. The airflow greatly reduces breathing effort, making the PAPR more comfortable to wear. The C420 is airtight, waterproof and may be fully submerged for decontamination.