Patent 8714157 was granted and assigned to Fisher & Paykel Healthcare on May, 2014 by the United States Patent and Trademark Office.
A mask (30) is disclosed that has a gas outlet (37) which is quiet and provides for a diffused outlet flow of gases. The outlet (37) is preferably a slot formed between a hollow body and cover over said hollow body. The mask also preferably extends and seals under a users chin in use.