A ventilated hood, comprising: an external air flow hose coupled to the ventilated hood; an emergency breathing apparatus (104, 190) comprising a filter incorporated in the ventilated hood, the filter having an exterior face and an interior face, where the exterior face of the filter faces towards an exterior of the ventilated hood and wherein the interior face of the filter faces towards an interior of the ventilated hood; a first seal coupled to one of the exterior of the ventilated hood or the exterior face of the filter; a head enclosure; and characterized in that the ventilated hood further comprises a collar positioned so as to, in use as a hood, be proximal to the neck of a user and coupled to the external air flow hose and configured to: inflate in response to receiving air flow from the external air flow hose for impeding infiltration of contaminants from an external environment to an interior of the head enclosure by taking up space between the ventilated hood and the neck of the user; and leak the received airflow in a controlled manned such that removal of the received airflow deflates the collar to avoid suffocation; and the emergency breathing apparatus (104, 190) further comprises: a facepiece operable to fit over the nose and mouth of the user, wherein the facepiece includes a mouthpiece to allow the user to hold the facepiece against their face, wherein an edge of the facepiece seals against the face of the user when worn; and a breathing pipe passing through an opening in the facepiece, wherein the breathing pipe is coupled at one end to the filter and at the other end to the mouthpiece, wherein the collar comprises a crossing configured to allow the breathing pipe to pass through the collar. an external air flow hose coupled to the ventilated hood; an emergency breathing apparatus (104, 190) comprising a filter incorporated in the ventilated hood, the filter having an exterior face and an interior face, where the exterior face of the filter faces towards an exterior of the ventilated hood and wherein the interior face of the filter faces towards an interior of the ventilated hood; a first seal coupled to one of the exterior of the ventilated hood or the exterior face of the filter; a head enclosure; and characterized in that the ventilated hood further comprises a collar positioned so as to, in use as a hood, be proximal to the neck of a user and coupled to the external air flow hose and configured to: inflate in response to receiving air flow from the external air flow hose for impeding infiltration of contaminants from an external environment to an interior of the head enclosure by taking up space between the ventilated hood and the neck of the user; and leak the received airflow in a controlled manned such that removal of the received airflow deflates the collar to avoid suffocation; and inflate in response to receiving air flow from the external air flow hose for impeding infiltration of contaminants from an external environment to an interior of the head enclosure by taking up space between the ventilated hood and the neck of the user; and leak the received airflow in a controlled manned such that removal of the received airflow deflates the collar to avoid suffocation; and the emergency breathing apparatus (104, 190) further comprises: a facepiece operable to fit over the nose and mouth of the user, wherein the facepiece includes a mouthpiece to allow the user to hold the facepiece against their face, wherein an edge of the facepiece seals against the face of the user when worn; and a breathing pipe passing through an opening in the facepiece, wherein the breathing pipe is coupled at one end to the filter and at the other end to the mouthpiece, a facepiece operable to fit over the nose and mouth of the user, wherein the facepiece includes a mouthpiece to allow the user to hold the facepiece against their face, wherein an edge of the facepiece seals against the face of the user when worn; and a breathing pipe passing through an opening in the facepiece, wherein the breathing pipe is coupled at one end to the filter and at the other end to the mouthpiece, wherein the collar comprises a crossing configured to allow the breathing pipe to pass through the collar.