What step involves checking the seal of the mask during proper masking procedures?

The step that involves checking the seal of the mask during proper masking procedures is critical for ensuring effectiveness and safety. This step typically comes after putting the mask on and is essential because a proper seal is necessary to protect the wearer from hazardous materials, including chemical, biological, or radiological threats. Insufficient sealing can compromise the protective function of the mask, leading to exposure.

In this context, ensuring a tight seal involves specific techniques, such as performing a seal check, which can include inhalation or exhalation methods to verify that air does not leak in around the mask edges. This step typically follows the initial wearing of the mask and is crucial before commencing any operations in potentially dangerous environments.

The other steps in the masking process may involve preparing the mask or familiarizing oneself with its components, but the seal check is uniquely focused on ensuring user safety and functionality.