This air-conditioning system includes an air conditioner an air-conditioning room temperature sensor; and a system controller. In the system controller, a room target temperature obtainer obtains a plurality of room target temperatures. Moreover, a ventilation airflow determiner determines the ventilation airflow of each of the delivery fans on the basis of the room target temperature, the temperature in the corresponding room, and the temperature in the air-conditioning room, and a fan airflow controller controls the ventilation airflow of each of the delivery fans according to the ventilation airflow determined by the ventilation airflow determiner.

This air-conditioning system includes an air conditioner an air-conditioning room temperature sensor; and a system controller. In the system controller, a room target temperature obtainer obtains a plurality of room target temperatures. Moreover, a ventilation airflow determiner determines the ventilation airflow of each of the delivery fans on the basis of the room target temperature, the temperature in the corresponding room, and the temperature in the air-conditioning room, and a fan airflow controller controls the ventilation airflow of each of the delivery fans according to the ventilation airflow determined by the ventilation airflow determiner.

An exhaust pipe system for conducting exhaust gas from a combustion device to an exhaust system includes a first exhaust pipe with an inlet end and an outlet end, and a second exhaust pipe having a first line end and a second line end, wherein the inlet end of the first exhaust pipe is connectable to the first line end of the second exhaust pipe via a detachable coupling connection. A locking member is arranged to be movable between a closed position closing a passage and an open position opening the passage inside the first exhaust pipe. When the coupling connection is released, the locking member is automatically arranged in the closed position, and the second exhaust pipe has an actuating member which, when the coupling connection is established, urges the locking member into the open position.

A multi-functional air quality control system including an air conditioner system member for regulating air temperature, an exhaust system member for regulating air pollution, a dehumidifier/humidifier system member for regulating humidity in the air, a sensor for monitoring indoor air quality conditions and for sending control inputs to a control unit for controlling the operation of one or more of the system members based on the monitored air quality conditions and one or more user-selectable operating settings, a control unit for controlling the operation of the one or more system members based on control inputs received from one or more sources, and a housing unit having a cavity in which is mounted the air conditioner system member, the exhaust fan system member, the dehumidifier/humidifier system member and the control unit.

A multi-functional air quality control system including an air conditioner system member for regulating air temperature, an exhaust system member for regulating air pollution, a dehumidifier/humidifier system member for regulating humidity in the air, a sensor for monitoring indoor air quality conditions and for sending control inputs to a control unit for controlling the operation of one or more of the system members based on the monitored air quality conditions and one or more user-selectable operating settings, a control unit for controlling the operation of the one or more system members based on control inputs received from one or more sources, and a housing unit having a cavity in which is mounted the air conditioner system member, the exhaust fan system member, the dehumidifier/humidifier system member and the control unit.

A refrigerant leak management system includes a return inlet assembly and a purge exhaust outlet assembly. The system also includes a sensor configured to detect refrigerant proximate an air handling enclosure of a HVAC unit. The system further includes a controller configured to control the system to drive air from a conditioned interior space of a building into an external environment via the purge exhaust outlet assembly when the sensor detects the refrigerant proximate the air handling enclosure by: actuating the return inlet assembly to close the return inlet assembly, actuating the purge exhaust outlet assembly to open the purge exhaust outlet assembly, and activating a reversible supply fan of the HVAC unit in a reverse direction.

A refrigerant leak management system includes a return inlet assembly and a purge exhaust outlet assembly. The system also includes a sensor configured to detect refrigerant proximate an air handling enclosure of a HVAC unit. The system further includes a controller configured to control the system to drive air from a conditioned interior space of a building into an external environment via the purge exhaust outlet assembly when the sensor detects the refrigerant proximate the air handling enclosure by: actuating the return inlet assembly to close the return inlet assembly, actuating the purge exhaust outlet assembly to open the purge exhaust outlet assembly, and activating a reversible supply fan of the HVAC unit in a reverse direction.

A refrigerant leak management system includes a return inlet assembly and a purge exhaust outlet assembly. The system also includes a sensor configured to detect refrigerant proximate an air handling enclosure of a HVAC unit. The system further includes a controller configured to control the system to drive air from a conditioned interior space of a building into an external environment via the purge exhaust outlet assembly when the sensor detects the refrigerant proximate the air handling enclosure by: actuating the return inlet assembly to close the return inlet assembly, actuating the purge exhaust outlet assembly to open the purge exhaust outlet assembly, and activating a reversible supply fan of the HVAC unit in a reverse direction.

A refrigerant leak management system includes a return inlet assembly and a purge exhaust outlet assembly. The system also includes a sensor configured to detect refrigerant proximate an air handling enclosure of a HVAC unit. The system further includes a controller configured to control the system to drive air from a conditioned interior space of a building into an external environment via the purge exhaust outlet assembly when the sensor detects the refrigerant proximate the air handling enclosure by: actuating the return inlet assembly to close the return inlet assembly, actuating the purge exhaust outlet assembly to open the purge exhaust outlet assembly, and activating a reversible supply fan of the HVAC unit in a reverse direction.

A refrigerant leak management system includes a return inlet assembly and a purge exhaust outlet assembly. The system also includes a sensor configured to detect refrigerant proximate an air handling enclosure of a HVAC unit. The system further includes a controller configured to control the system to drive air from a conditioned interior space of a building into an external environment via the purge exhaust outlet assembly when the sensor detects the refrigerant proximate the air handling enclosure by: actuating the return inlet assembly to close the return inlet assembly, actuating the purge exhaust outlet assembly to open the purge exhaust outlet assembly, and activating a reversible supply fan of the HVAC unit in a reverse direction.