Patent attributes
A mask for use at an operating pressure substantially equal to atmospheric pressure includes a body with a three-dimensional shaped chamber that is configured to receive a user's mouth and nares and operate at the operating pressure. The mask also includes a seal forming structure with a nose seal portion that extends around at least a portion of the user's nares on an inferior side of the user's nose inferior to the user's nasal ridge, and a mouth seal portion that forms a seal at least partially around the user's mouth and between the user's chin and lip inferior. The nose seal portion is directly connected to the mouth seal portion. The mask also includes a positioning and stabilising structure to provide a force to hold the seal forming structure in position against the user.
