Chest compression devices, systems, and methods

A percussive pulsed air device, comprising:

• an airflow generator controlling an amplitude of the percussive pulsed air;
• a pulse frequency control module controlling a frequency of the percussive pulsed air;
• a first port and a second port provided on the pulse frequency control module, one or more of the first port and the second port being for directing airflow into the pulse frequency control module in a first direction, wherein a first line is defined through a center point of the first port and a center point of the second port and wherein the first direction is perpendicular to the first line;
• a pressure control unit for receiving the percussive pulsed air from the pulse frequency control module and providing the percussive pulsed air to a patient device;
• and
• a third port and a fourth port provided on the pressure control unit, one or more of the third port and the fourth port being for directing airflow from the pulse frequency control module, wherein a second line is defined through a center point of the third port and a center point of the fourth port;
• wherein the first line is transverse to the second line, and wherein the first line is arranged at a 45 degree angle with respect to the second line.