How many times should you breathe in when checking your mask seal?

When checking your mask seal, the correct number of breaths to take is three. This method is designed to ensure that the mask is properly fitted and sealed against your face, which is crucial for effective performance and safety. By inhaling three times, you create a proper test condition where the mask should automatically pull against your face with each breath.

When you inhale, the negative pressure created inside the mask will indicate whether or not the mask is sealed correctly. If you feel any air leaking out around the edges during these breaths, it signifies that the seal is not secure, and the mask should be adjusted until a proper fit is achieved. This three-breath method serves as a reliable check before proceeding with any activities requiring the mask, ensuring that the air supply will meet your needs without contamination or insufficient pressure.