A filter media analysis system which utilizes particulate buildup to close notches or breaks provided along a passive circuit, wherein closure of the notches results in an activation of the circuit and transmission at a particular frequency which activation and transmission can be correlated to a life cycle point of the filter media.

An air purifier filter system comprises an air purifier filter unit and a machine readable identifier which provides information concerning the filter unit type and performance information specific to a target pollutant to be filtered by said air purifier filter unit from a plurality of different pollutants that can be filtered by that filter unit type. This information can be used to provide an end of life prediction for the filter unit or provide advice that the filter should be changed for other reasons. This enables the user to be given advance warning, and to be given instructions when it is time to change the filter unit. The instructions to change the filter unit may be more accurate than a simple timer as they can take account of the type of filter unit and the performance information. In some examples the use history of the filter unit may also be used to predict the time when it should be changed.

Disclosed is a hair care applianceincluding: a housing having a first end and a second end and a fluid inlet which extends around the housing and is proximate the first end of the housing, a fluid outlet, a fluid flow path extending within the housing between the fluid inlet and the fluid outlet. The fluid inlet is provided with a filtering system including a removable portion and a fixed portion. The removable portion includes a first part and a second part which are separable and wherein the first part can only be secured to the housing when the second part is attached to the first part. The first part may be a sleeve capable of sliding over the second part. The second part may include a tubular portion and base portion extending radially out from the tubular portion at one end of the tubular portion.

According to the present disclosure, air cleaner assemblies, housings, serviceable filter cartridges and features, components, and methods, relating thereto are disclosed. In general, the features relate to systems that are configured to aid in inhibiting an improper cartridge from being installed in an air cleaner housing, during servicing. A variety of features are characterized, and in many examples, the cartridge includes a seal arrangement having radially directed seal surface with at least a first non-wavy or non-projection/recess section and a second wavy or projection/recess section. Examples are shown and described in detail.

Air cleaner assemblies, components, and features are described. The features can be used to provide that the air cleaner assembly cannot be fully closed, even if a cartridge is nested therein, and appears to be sealed, unless that cartridge is a proper one for the system of concern. The effect is to prevent an inappropriate cartridge, that does not properly seal, from being inadvertently installed in the assembly.

A smart mask includes a face covering, an attachment member, one or more sensors, and a controller. The face covering is configured to cover a face area of a wearer. The attachment member is configured to attach the face covering onto the face area of the wearer. The one or more sensors comprises an air quality sensor configured to obtain first data associated with nearby air quality or a breathing pattern sensor configured to obtain second data associated with the wearer's breathing pattern. The controller is configured to process the first data associated with nearby air quality to identify a current air quality, or process the second data obtained by the breathing pattern. In response to determining that the current air quality is worse than a predetermined threshold, or identifying a particular breathing pattern, the controller is configured to generate a notification, notifying the wearer.

The present invention provides an air purifier. The air purifier according to one preferred embodiment, of the present invention may comprise: a housing; a blowing unit installed in the housing so as to draw in external air; and a filter unit having filtering surfaces, through which the air passes and which are disposed in multiple directions, and an air inflow space, which has at least a part thereof surrounded by the filtering surfaces disposed in the multiple directions and into which the air discharged from, the blowing unit flows.

An apparatus which includes an aspirated smoke detector, and a pre-filter coupled to an inflow port of the detector wherein the pre-filter carries a removable filter element. The filter element is configured such that when it is removed, fluid flow through the filter is blocked. When the filter element is present in the pre-filter, fluid flow through the filter is permitted.

An air cleaner structure for blocking an inflow of debris to prevent the debris from inflowing into an engine intake passage of an air cleaner housing when replacing a filter includes a rotator fixing the filter and a filter cover to the air cleaner housing and generating a rotating force to open and close the engine intake passage. An engine intake passage door opens and closes the engine intake passage by the rotating force of the rotator. A connector has one end connected to the rotator and another end connected to the engine intake passage door to deliver the rotating force to the engine intake passage door.

A filter cartridge for use in separating a hydrophobic liquid aerosol phase from a gas stream, as a crankcase ventilation filter for example, is described. The cartridge includes a media pack comprising filtration media surrounding an open interior and a first end piece. Various structure included on the first end piece is described. An example is a D-shaped projection. Also described is an assembly including the filter cartridge, specific features of a housing component of the assembly. Methods of assembly and use are also described.