The present invention provides a ventilation system for improving air quality of an indoor space. The system includes sensors for measuring PM2.5 particle level P, CO.sub.2 level C, and TVOC level T in the indoor space. A control circuit is configured to receive P, C and T values and generate an output signal Vout according to a specific algorithm, which in turn controls speed-variable EC motors that drive ventilating fans. The invention exhibits numerous technical merits such as lower energy consumption, programmable operation, high efficiency, and lower noise, among others.

An HVAC controller may wirelessly communicate with a mobile wireless device that provides a user interface for interacting with the HVAC controller. In some cases, the communication module wirelessly receives a sensed parameter from a remote wireless sensor in a living space of the building and receives a wired input from a return air sensor. A controller may be operatively coupled to the communication module and may control the HVAC system based at least in part on the sensed parameter from the remote wireless sensor when the sensed parameter from the remote wireless sensor is available and, in some cases, control the HVAC system based at least in part on the return air parameter when the sensed parameter from the remote wireless sensor is not available.

An apparatus and method controls an environmental control system to maintain a differential pressure between a room and one or more adjacent areas by (1) determining a differential pressure error based on the differential pressure and a differential pressure set point using a proportional-integral-derivative (PID) controller; (2) increasing an air change per hour set point whenever one or more first parameters are satisfied; (3) decreasing the air change per hour set point whenever one or more second parameters are satisfied; and (4) sending one or more control signals to the environmental control system that maintain the differential pressure between the room and the one or more adjacent areas by adjusting: (a) the leading airflow to be approximately equal to the air flow change set point multiplied by a volume of the room divided by 60, and (b) the tracking airflow to maintain a volume differential set point.

Systems, methods, and non-transitory computer-readable media for continuously monitoring residential air quality and providing a trend based analysis regarding various air pollutants are presented herein. The system comprises an air quality monitor located in a residential house, wherein the air quality monitor is configured to measure the level of an air pollutant. The system also includes a server that is communicatively coupled to the air quality monitor, wherein the server is configured to generate a unique environmental fingerprint associated with the residential house.

An arrangement (1) for air management of a room (100) comprises ventilating means (10) for enabling exchange of air between the inside environment (102) of the room (100) and the outside environment (103) of the room (100); a stand-alone air purifier (20), which is arranged separately from the ventilating means (10), and which is adapted to remove pollutants from the air in the inside environment (102) of the room (100); and a control system (30, 31, 32), which is in communication with both the ventilating means (10) and the air purifier (20), and which is adapted to control operation of the ventilating means (10) and the air purifier (20) in dependence of air quality data relating to the inside environment (102) of the room and the outside environment (103) of the room, the control system (30,31,32) being configured to control the ventilating means (10) and the air purifier (20) differently depending on whether the air quality data relating to the outside environment of the room (100) is above or below a predetermined reference. Operation of the arrangement (1) is aimed at optimizing indoor air quality and minimizing energy consumption.

Disclosed is a system and method for control of in-door ventilation in a building having a series of rooms separated by walls. The system includes: at least one air treatment device arranged to treat the air; a plurality of fan units, including a fan and at least one sensor; and a central computing device adapted to collect data from the sensors and control the fans. Each wall is provided with an opening, the fan units are disposed in the openings to provide an air flow transporting air from the first room through the series of rooms to the last room and then back to the first room, and the air treatment device is disposed to treat the air.

Disclosed example respirators comprise: a filter configured to filter the air; a blower fan configured to provide continuous air flow at variable speeds; an air duct configured to direct air from the blower fan to an exhaust location, the blower fan configured to blow air through the air duct; and a blower controller configured to: control the blower fan to automatically adjust an airflow speed of the blower fan to a plurality of airflow speeds over a plurality of different time periods, the plurality of airflow speeds being within an airflow speed range.

An air filtering shelter 100 comprising a shelter frame 110 comprising a plurality of frame members 112 defining a sheltered area 102. Filter media 120 extends across the plurality of frame members 112, where the filter media 120 is disposed over the sheltered area 102. An airflow guide 130 extends across the plurality of frame members 112 between the sheltered area 102 and the filter media 120. The airflow guide 130 is impermeable and the filter media 120 and the airflow guide 130 define an airflow channel 125 between them. An airflow generator 140-1 is coupled to the shelter frame 110. The airflow generator 140-1 has an inlet 142 in the airflow channel 125 and an outlet 144 in the sheltered area 102.

An air cleaner including a case comprising an upper surface and a side surface, a sensor to measure a degree of contamination of air introduced into the case, a round portion in a shape that is curved on the upper surface of the case, and a sensor air inlet on the round portion and through which air is introduced.

An air quality indicator for indicating high fine particle levels in an environment of interest. The indicator includes a frame maintaining first and second air filter media. The first air filter medium differs from the second air filter medium at least in terms of a change in visual appearance (e.g., color) when subjected to air flow containing fine particles.