Masks are made with vent holes to allow exhaled air to reach the atmosphere. If this did not happen, carbon dioxide would accumulate and suffocate the user. Each mask has its own intentional leak rate which increases with pressure. The amount of the intentional leak rate versus pressure can be found in the instruction manual that comes with the mask. Some rates have beentabulated on the World Wide Web. While some machines/software/mask combinations take into account the intentional leak rate when reporting leak rates, most machines report the total leak rate. The total leak rate is the sum of the intentional leak rate (the air leaking out the vent holes in the mask) and the residual leak rate, the air leaking accidently out of the system.
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