What is the purpose of performing a fit check before using a respirator?

Performing a fit check before using a respirator is essential to ensure that the respirator forms a proper seal on the face, which is critical for effective protection against airborne contaminants, such as pesticides. A tight fitting seal prevents any outside air from bypassing the filter or cartridge, which could introduce harmful substances into the breathing zone of the user. This process typically involves simple checks, such as inhaling and exhaling while wearing the respirator to detect any air leaks.

While other choices highlight important aspects of respirator use, they do not specifically address the critical need for a proper fit and seal. Ensuring the respirator looks clean and intact is important for effective operation but does not guarantee that it fits correctly. Confirming that the respirator is appropriate for the specific pesticide being used is vital for adequate protection against particular hazards but does not relate to the seal on the user’s face. Checking the expiration date of the cartridges is also necessary to ensure filter effectiveness but, again, does not address the fit of the respirator itself. Therefore, focusing on the tight fit ensures that the respirator will perform as intended, providing the necessary protection during pesticide application.