Final answer:
A respiratory inlet covering designed to partially seal the face and protect from airborne particles is known as a Breathing Mask.
Step-by-step explanation:
A respiratory inlet covering that is designed to form a partial seal with the face is known as a Breathing Mask. This form of respiratory protection is essential in environments where the air is contaminated with particulate matter such as dust, viruses, bacteria, or harmful chemicals which can damage the lungs or stimulate allergic immune responses. The mucociliary escalator within the human respiratory system naturally traps and moves such particles out of the nasal passages and respiratory tract to protect against tissue damage. However, in situations or jobs requiring an extra layer of protection, a breathing mask or similar device provides an essential safeguard to ensure clean air reaches the lungs without harmful contaminants.