An electric switching unit comprises a casing and a plurality of arc extinguishing chambers formed inside the casing, each arc extinguishing chamber comprising a gas discharge orifice opening to outside the casing. The electric switching unit comprises a filtering device positioned outside the casing and comprising: a plurality of inlet openings placed on a lower region of the filtering device, each one being configured to collaborate fluidically with one of the said gas discharge orifices; an outlet opening placed on a lateral region of the filtering device; a common internal chamber which places the inlet openings in fluidic communication with the outlet opening; and a filter located inside the internal chamber between the inlet openings and the outlet opening.

Examples are disclosed that relate to cooking systems with internal ventilation systems. One example provides a cooking system comprising a cooking appliance, a ventilation duct comprising an inlet aperture configured to receive cooking exhaust, a fan disposed within the ventilation duct, the fan being configured to pull the cooking exhaust through the inlet aperture and the ventilation duct, a particulate removal system positioned within the ventilation duct between the inlet aperture and the fan, and a grease containment pan disposed beneath the particulate removal system and comprising a mount for supporting the particulate removal system, the grease containment pan being removable from the ventilation duct by a user for cleaning.

A protective equipment includes a face shield configured for being worn by a patient to minimize exposure of a healthcare worker to the patient's bodily fluids, bacteria and/or viruses. The face shield includes a body having an upper peripheral edge and a lower peripheral edge. At least one port is formed in the body. The protective equipment may include a barrier positioned in the port. The protective equipment may further include an extended member secured to the lower peripheral edge of the face shield, and configured to substantially inhibit or trap micro aerosolized particles from traversing the extended member. The protective equipment includes an air flow system configured to receive and filter air from an environment external to the face shield and pull the patient's expelled air away from the patient's face and filter or clean the expelled air.

A filter device for filtering particles from an air stream has an inlet channel through which the air to be purified flows, at least one filter element through which the air can flow and which is interchangeably held in a flow channel, and an outlet channel through which the purified air flows, an insertion chamber which can be closed by a door and from which a filter element can be fed to the flow channel, and an output chamber closable by a closure element, into which a filter element is feedable from the flow channel. The closure element of the output chamber is locked in the closed position via a locking mechanism when the door on the insertion chamber is opened and the output chamber and the insertion chamber are connected to the same flow channel.

A filter device for filtering particles from an air flow has an inlet channel through which the air to be cleaned flows, at least one filter element through which the air can flow and which is held replaceably in a flow channel, and an outlet channel through which the cleaned air flows. The filter device has an insertion chamber which can be closed by a door and from which a filter element can be fed to the flow channel, and an output chamber which can be closed by a closure element and into which a filter element can be fed from the flow channel. A cover is attachable to the filter element, which covers a filter cake on the filter element so that the unit of filter element and cover is removable from the output chamber together.

An air cleaning system having at least one dust sensor and a method for controlling the air cleaning system may improve accuracy of dust sensors through linkage control of the dust sensors, and may normally operate a faulty air cleaner using dust sensors of the remaining communicating air cleaners other than the faulty air cleaner even when any one of the dust sensors fails to operate. The air cleaning system may select a master dust sensor through linkage control of the dust sensors, and may operate the plurality of air cleaners only using sensor information of the master dust sensor. Therefore, the air cleaning system may stop operation of the remaining dust sensors other than the master dust sensor, may reduce measurement noise produced by the dust sensors and power consumption, and may increase a lifetime of the dust sensors.

An air cleaner is provided that may include a first air cleaning module having a first fan that generates air flow from a first suction inlet toward a first discharge outlet; a second air cleaning module having a second fan that generates air flow from a second suction inlet toward a second discharge outlet; a dividing plate provided between the first air cleaning module and the second air cleaning module; and a display provided at inside of the dividing plate and in which a light source is provided.

An oil separator to separate oil from oil and refrigerant mixture. The oil separator includes inlets to allow entry of the oil and refrigerant mixture into the oil separator. The mixture flows and strikes on center of the one or more walls of the oil separator. The mixture then flows towards demister pads for filtration. The oil is separated from the mixture and exits the oil separator from the oil outlet. The refrigerant separated from the mixture escapes through the refrigerant outlet.

Examples are disclosed that relate to cooking systems with internal ventilation systems. One example provides a cooking system comprising a cooking appliance, a ventilation duct comprising an inlet aperture configured to receive cooking exhaust, a fan disposed within the ventilation duct, the fan being configured to pull the cooking exhaust through the inlet aperture and the ventilation duct, a particulate removal system positioned within the ventilation duct between the inlet aperture and the fan, and a grease containment pan disposed beneath the particulate removal system and comprising a mount for supporting the particulate removal system, the grease containment pan being removable from the ventilation duct by a user for cleaning.

Disclosed herein is an air cleaner capable of being coupled or separated in a vertical direction to improve space utilization. An air cleaner may include a first air cleaning module provided with a first connection unit, and a second air cleaning module detachably coupled to the first air cleaning module and provided with a second connection unit, wherein the second connection unit is configured to be detachably coupled to the first connection unit, and configured to be rotatable with respect to the first connection unit when the second connection unit is coupled to the first connection unit.