Respirator negative pressure fit check devices and methods

A respiratory mask, comprising:

• a mask body defining a breathable air zone for a wearer and having one or more inlet ports configured to receive one or more breathing air source components, wherein the mask body further comprises a fluid intake communication component configured to provide fluid communication between an inlet port of the one or more inlet ports and an opening defined within the mask body;
• and
• a shut-off valve operable between a closed position and an open position, wherein the shut-off valve comprises one or more sealing pads configured to block the one or more inlet ports, when the shut-off valve is in the closed position, to prevent fluid communication between the one or more inlet ports and the breathable air zone;
• wherein the shut-off valve includes an actuator formed of a flange and a span extending from the flange, the span configured to provide tactile feedback in response to an applied force placed on the actuator when operated from the open position to the closed position.