An HVAC actuator configured to actuate an HVAC component may include a rotatable output shaft having a range of rotation between a first end position and a second end position, a drive mechanism configured to selectively drive the output shaft, and a housing for housing the drive mechanism. The HVAC actuator may include a position indicator viewable from a front side of the housing that moves as the output shaft is rotated such that the position indicator indicates a current position of the output shaft. The position indicator may include an indicator wheel that is directly coupled to the output shaft of the HVAC actuator and may rotate with the output shaft. The indicator wheel may have one or more markings that move with the indicator wheel. The one or more markings may include a line extending in a radial direction from a rotation axis of the indicator wheel.

The cyclone separation device has a case (1), a space partition plate (7), and a cylindrical member (11). The case (1) is formed into a cylindrical shape and has a first intake port (4), an outflow port (6), and a second intake port (5).

The first intake port (4) has a circumferential opening (2) circumferentially formed in a side surface on a side of the one end of the case (1), and a fixed blade (3) arranged along the circumferential opening (2). The outflow port (6) is disposed on a surface on the side of the one end and discharges the swirling airflow fed through the first intake port (4). The second intake port (5) is disposed on a side surface on a side of the other end opposite to the one end.

An air circulation circuit including components that are in fluid communication. An air return connection is disposed downstream of the indoor space wherein the air return connection is configured to deliver an air stream from the indoor space to an economizer. The economizer is disposed downstream of the air return connection. The economizer is configured to exhaust a portion of the air stream. The economizer is configured to take in an amount of fresh air to mix with the air stream. The economizer further includes an air return fan disposed inside of the economizer to facilitate a flow of the air stream.

A system for circulating air inside a manhole vault. The system includes an air-moving device in fluid communication with the manhole vault and configured to circulate the air inside the manhole vault to prevent a concentration of combustible gasses or to enhance cooling therein.

The present invention is intended for use in large conditioned air plenum environments and particularly in the plenum environment of multilevel raised floor electro-mechanical distribution systems. The invention comprises the step of providing at least one height change of dedicated conditioned air plenum, which alters the plenum's volume. This makes it possible to maintain the preferred static pressure and velocity for conditioned air throughout the entire plenum even as the amount of air in the plenum decreases as conditioned air discharges into the intended space outside of the plenum.

The present invention is intended for use in large conditioned air plenum environments and particularly in the plenum environment of multilevel raised floor electro-mechanical distribution systems. The invention comprises the step of providing at least one height change of dedicated conditioned air plenum, which alters the plenum's volume. This makes it possible to maintain the preferred static pressure and velocity for conditioned air throughout the entire plenum even as the amount of air in the plenum decreases as conditioned air discharges into the intended space outside of the plenum.

A method of ventilating a battery room comprises detecting a hydrogen concentration in the battery room, determining whether the hydrogen gas concentration is at or above a first threshold concentration, activating two or more exhaust fans to ventilate the battery room simultaneously when the battery charging process is triggered or when the hydrogen gas concentration is at or above the first threshold, and identifying a location in the battery room at which hydrogen is being released. In certain embodiments, notifications are generated and provided concerning the identified location in the battery room at which hydrogen is being released.

Disclosed is a method of operating an air purifier by executing an artificial intelligence (AI) algorithm and/or a machine learning algorithm in a fifth generation (5G) environment connected for the Internet of Things. A method for operating an air purifier comprises determining whether an indoor situation is a situation in which protection of a filter is necessary based on sensor information from at least one sensor, in response to a determination that the indoor situation is the situation in which protection of the filter is necessary, suspending an air purifying function, and operating one or more ventilation devices. According to the present disclosure, it is possible to protect the air purifier from a situation in which a life of the filter of the air purifier can be drastically shortened.

Disclosed is a method of operating an air purifier by executing an artificial intelligence (AI) algorithm and/or a machine learning algorithm in a fifth generation (5G) environment connected for the Internet of Things. A method for operating an air purifier comprises determining whether an indoor situation is a situation in which protection of a filter is necessary based on sensor information from at least one sensor, in response to a determination that the indoor situation is the situation in which protection of the filter is necessary, suspending an air purifying function, and operating one or more ventilation devices. According to the present disclosure, it is possible to protect the air purifier from a situation in which a life of the filter of the air purifier can be drastically shortened.

The present disclosure relates to a system and method for monitoring and reporting the energy consumption of an appliance or fixture installed within a building structure. More particularly, the present disclosure relates to a system and method for monitoring usage of a ventilation unit, such as an installed bathroom exhaust fan or cooktop/range ventilation hood. The system and method captures usage data of the ventilation unit, and transfers the usage data to a connected electronic device for determining the energy consumed by the ventilation unit and reporting the same to a user.