What is the primary purpose of a user seal check?

The primary purpose of a user seal check is to ensure that there is no leakage from the respirator. This is a crucial step for anyone using a respirator, particularly in environments where there is a risk of exposure to hazardous materials such as lead. A proper seal ensures that the respirator provides an effective barrier, protecting the wearer from inhaling harmful substances.

Conducting a user seal check confirms that the respirator fits securely against the face, which is key to maintaining its effectiveness. When a respirator has a good seal, air is drawn in through the filter rather than around the edges, which minimizes the risk of exposure.

The other options, while related to respirator use in some way, do not address this critical aspect. For instance, measuring lead content in the air is a different evaluation and unrelated to the fit of the respirator. Determining the weight of the respirator or confirming the brand is not relevant to its performance in protecting the wearer from airborne contaminants. Thus, ensuring no leakage is the essential function of a user seal check.