When an instruction to request increase in the amount of air supply of air supply fan (2) is generated, operating conditions of air conditioner (3) is determined based on outdoor temperature information acquired by outdoor temperature acquisition unit (24) and indoor temperature information acquired by indoor temperature acquisition unit (32). Then, air conditioner (3) is instructed on the determined operating conditions.

A wall mountable sensor module includes a housing defining an internal space that is segmented into a first internal space and a second internal space. The first internal space defines an air channel that extends from an air inlet to an air outlet. Two or more sensors are configured to be exposed to the air flow channel. A first sensor is configured to detect a first air parameter and a second sensor is configured to detect a second different air parameter, wherein the second sensor is situated downstream of the first sensor in the air flow channel. The sensor module includes a fan housed by the housing, the fan configured to cause an airflow to flow in through the air inlet, through the air flow channel thereby exposing each of the sensors to the airflow, and out through the air outlet.

A heating, ventilation, and air conditioning (HVAC) system includes an air handling unit, a supply airflow damper to direct a supply airflow from the air handling unit to a conditioned space, and one or more filters selectively deployable across a flowpath of the air handling unit to remove one or more contaminants from the supply airflow prior to the supply airflow passing through the supply airflow damper. A control system is operably connected to the one or more filters to direct movement of the one or more filters between a deployed position and a stowed position.

An outside air processing device adjusts the temperature and humidity of outside air taken thereinto, and then supplies the adjusted air to a target space. The outside air processing device includes a heating element configured to heat air, a humidifying element configured to humidify air that has passed through the heating element, and a control unit for outside air processing configured to change the temperature of air at an inlet of the humidifying element in accordance with the humidity in the target space.

A risk information provision device is provided, comprising: an information acquisition unit for acquiring risk information related to a risk depending on a status of a carbon dioxide concentration in a determination target and risk handling information for handling the risk, wherein the status of the carbon dioxide concentration is determined based on a temporal change in the carbon dioxide concentration in the determination target; and a provision unit for providing at least one of the risk information or the risk handling information, wherein the risk handling information includes recipient information related to a recipient to which the risk information is provided, and the provision unit is configured to provide the risk information to the recipient.

A method comprising detecting an indoor carbon dioxide level; detecting an outdoor fine dust level; driving an air supply fan and an exhaust fan such that an air supply amount of the air supply fan is greater than an exhaust amount of the exhaust fan based on detected indoor carbon dioxide level and outdoor fine dust level; and performing a first indoor pressure control of detecting an indoor pressure and controlling the air supply fan and the exhaust fan. In the indoor pressure control, based on the detected indoor pressure being less than a first set value, a number of revolutions per minute of the exhaust fan is controlled to be decreased, and based on the detected indoor pressure is greater than or equal to a second set value greater than the first set value, the number of revolutions per minute of the exhaust fan is controlled to be increased.

A system for detecting and cleaning air pollution in indoor space with heating, ventilation and air conditioning includes one or more outdoor gas detection devices, several indoor gas detection devices, several filtering devices, and a central controller. The central controller receives air pollution data detected by the gas detection devices, by connecting to a cloud device, performs an intelligent computation and comparison on the air pollution data to locate an air pollution location, and the cloud device transmits a control command intelligently and selectively to the central controller. Therefore, according to the control command, the central controller controls the air conditioning modulation mechanism of one or more HVAC components and enables the filtering devices to generate a directed air convection, thereby achieving the filtration of the air pollution to allow the indoor air pollution data to be a safety detection value.