This application relates to ventilation systems, more particularly to roof ventilation systems that help to protect buildings against fires. The roof vent has an ember impedance structure that impedes the entry of flames and embers or other floating burning materials while still permitting sufficient air flow to adequately ventilate a building. Several configurations of vents employing baffle members and fire-resistant mesh material are described, which can substantially prevent the ingress of floating embers and flames.

Washing machine appliance ventilation systems and methods include rotating a wash basket of the washing machine appliance for an ON period, whereby a flow of ambient air is drawn through an aperture in the washing machine appliance from an ambient environment into the wash basket. The systems and methods also include comparing a humidity within the washing machine appliance to a reference humidity value. When a difference between the humidity within the washing machine appliance and the reference humidity value is greater than a threshold, the step of rotating the wash basket for the ON period is repeated. When the difference between the humidity within the washing machine appliance and the reference humidity value is less than or equal to the threshold, the ventilation cycle or method is terminated.

An indoor pollution prevention system includes a plurality of gas detection modules, one or more intelligent control-driving processing devices, one or more gas-exchange processing devices, one or more intake passages, and one or more discharge passages. The intake passage is connected to the gas-exchange processing device and has an intake opening for guiding the outdoor gas into an indoor space. The discharge passage is connected to the gas-exchange processing device and has a discharge opening for discharging the air pollution source to the outdoor space. The intelligent control-driving processing device controls the gas-exchange processing device to be enabled under a surveillance condition of the gas detection module, so that the air pollution source passes through the discharge passage, filtered and purified by a cleaning and filtration assembly, and is discharged to the outdoor space, thereby allowing the indoor space to have a clean air.

Environmental characteristics of habitable environments (e.g., hotel or motel rooms, spas, resorts, cruise boat cabins, offices, hospitals and/or homes, apartments or residences) are controlled to eliminate, reduce or ameliorate adverse or harmful aspects and introduce, increase or enhance beneficial aspects in order to improve a “wellness” or sense of “wellbeing” provided via the environments. Control of intensity and wavelength distribution of passive and active Illumination addresses various issues, symptoms or syndromes, for instance to maintain a circadian rhythm or cycle, adjust for “jet lag” or season affective disorder, etc. Air quality and attributes are controlled. Scent(s) may be dispersed. Hypoallergenic items (e.g., bedding, linens) may be used. Water quality is controlled. Noise is reduced and sounds (e.g., masking, music, natural) may be provided. Passive and active pathogen controls are employed. Controls are provided for the occupant and/or facility personnel, as is instruction, and surveys, including assessing wellness.

The present disclosure relates to a method of controlling operation state of multi-split air conditioner and system, and a heat pump multi-split. The control method includes: determining a target operation mode of each indoor unit according to an operation mode set by a user for the indoor unit; performing statistics on heat exchange demands of the indoor units corresponding to different target operation modes, and determining a dominant operation mode among the target operation modes according to the heat exchange demands; and using the dominant operation mode as the operation mode of an outdoor unit.

An air conditioner unit includes a housing with an outdoor heat exchanger assembly and an indoor heat exchanger assembly therein. A makeup air intake duct an a makeup are exhaust duct are disposed above the housing parallel to each other. The air conditioner unit also includes a heat exchanger having a first coil and a second coil. The first coil is disposed within the makeup air intake duct. The second coil is disposed with the makeup air exhaust duct. The heat exchanger also includes a first pipe connecting an outlet of the first coil to an inlet of the second coil and a second pipe connecting an outlet of the second coil to an inlet of the first coil.

A humidifying system having a housing one or more water filters in fluid communication with a water source, a water purifier in fluid communication with the water filters, and a water storage tank in fluid communication with the water purifier. The system further includes a water reservoir in fluid communication with the water purifier and the water storage tank, a sterilizer in communication with water carried by the water storage tank, and a dispensing line that extends to a position external to the housing. The system yet further includes a dry mist generator to generate a dry mist using water from the water storage tank, an ozone generator to generate ozone to be mixed with the dry mist and expelled from the housing via the dispensing line. The system further includes a system controller in communication with the sterilizer, the dry mist generator, and the ozone generator.

Methods and apparatus to monitor environmental conditions and reduce condensation are disclosed. An example apparatus includes a first sensor system to measure a first temperature in a first area and a second sensor system to measure a second temperature in a second area adjacent to the first area. The first area being separated from the second area by a door. A controller has at least one memory, instructions, and processor circuitry to execute the instructions to at least: compare the first temperature and the second temperature; determine if a temperature difference between the first temperature and the second temperature exceeds a temperature threshold; and in response to determining that the temperature difference does not exceed the temperature threshold, deactivate a fan located in the first area.

Disclosed are techniques relating to an improved air quality device that can provide personalized comfort and improved air quality elements to occupants of a common space. The improved air quality device can comprise a plurality of individually adjustable directional outlets. The state of these individually adjustable directional outlets can be updated to individually satisfy comfort levels of various occupants at different locations within the common space, which can be determined based on inputs from a control device (e.g., thermostat), a sensor (e.g., occupancy sensor), and so forth. The improved air quality device can further comprise an ultraviolet light device that can reduce pathogens in the common space. The state of the ultraviolet light device (e.g., on/off, duration of on/off, a position/location, and so on) can be a function of the state of the state of the outlets.

A humidification system including a water-delivery system, an air-delivery system, a control system, and at least one fog-generation system. In example forms, the system includes a water-and-air delivery bar, a fog-delivery block, and/or a tubing-and-track delivery system. In another example form, a humidification system includes a housing having a nozzle discharge body, an air inlet coupling having an air delivery conduit extending therethrough, and a water inlet coupling having a water delivery conduit extending therethrough, and further including means for providing heating and/or a consistent back-pressure and flowrate across multiple nozzles in a multi-nozzle array.