A method of capturing carbon dioxide (CO.sub.2) present in air is provided. The method includes adding a carbon-dioxide-capturing device to a heating, ventilation, and air conditioning (HVAC) system of a building. The carbon-dioxide-capturing device is added to one or both of an air handler and air-distribution ductwork of the HVAC system. The method further includes circulating air including carbon dioxide through the carbon-dioxide-capturing device in the HVAC system. A direct decarbonization system for capturing carbon dioxide present in air is also provided. The system includes an HVAC unit, air-distribution ductwork connected to the HVAC unit, and a carbon-dioxide-capturing device disposed in one or both of the HVAC unit and the air-distribution ductwork. Carbon dioxide gas present in air passing through the HVAC unit or the air-distribution ductwork is removable from the air by the carbon-dioxide-capturing device.

A method of capturing carbon dioxide (CO.sub.2) present in air is provided. The method includes adding a carbon-dioxide-capturing device to a heating, ventilation, and air conditioning (HVAC) system of a building. The carbon-dioxide-capturing device is added to one or both of an air handler and air-distribution ductwork of the HVAC system. The method further includes circulating air including carbon dioxide through the carbon-dioxide-capturing device in the HVAC system. A direct decarbonization system for capturing carbon dioxide present in air is also provided. The system includes an HVAC unit, air-distribution ductwork connected to the HVAC unit, and a carbon-dioxide-capturing device disposed in one or both of the HVAC unit and the air-distribution ductwork. Carbon dioxide gas present in air passing through the HVAC unit or the air-distribution ductwork is removable from the air by the carbon-dioxide-capturing device.

Air purification device includes body case, electrolytic tank, electrolysis unit, sterilization tank, gas-liquid contact portion, air blower, opening, valve member that covers opening, and movement mechanism that moves valve member. Sterilization tank is disposed below opening, by movement mechanism, when valve member is separated from an opening edge of opening, opening is opened, the water including the active oxygen species of electrolytic tank is supplied to sterilization tank, when valve member hits the opening edge of opening, opening is closed, and the supply of the water including the active oxygen species of electrolytic tank to sterilization tank is stopped.

The disclosure is a humidifying and filtering floor register for HVAC systems, designed to passively improve air quality as air flows through duct openings. It features a main body with a central water reservoir for optimal airflow, a filter to capture dust and allergens, and a top grille with an integrated funnel for easy refilling without removing the unit. Child-safe snap features secure the grille, and the design supports additional accessories like booster fans and sensors. This modular, low-maintenance solution enhances indoor air quality, benefiting homes with children and eco-conscious users.

The disclosure is a humidifying and filtering floor register for HVAC systems, designed to passively improve air quality as air flows through duct openings. It features a main body with a central water reservoir for optimal airflow, a filter to capture dust and allergens, and a top grille with an integrated funnel for easy refilling without removing the unit. Child-safe snap features secure the grille, and the design supports additional accessories like booster fans and sensors. This modular, low-maintenance solution enhances indoor air quality, benefiting homes with children and eco-conscious users.