An electronic device includes a housing, a photocatalyst filter, at least one first sensor provided in the housing, a blower fan configured to introduce air into the housing, a light source configured to emit light to the photocatalyst filter, and a processor configured to control the blower fan and the light source, determine a degree of contamination of the photocatalyst filter based on a difference in sensor values between the at least one first sensor provided in the housing and at least one second sensor outside of the housing or a rate of change in sensor values between the at least one first sensor provided in the housing and the at least one second sensor outside the housing, and recycle the photocatalyst filter based on the determined degree of contamination of the photocatalyst filter.

Disclosed embodiments relate to a combination axial fan and LED lighting system configured to fit into the footprint of a standard ceiling tile. Disclosed embodiments further include ceiling tiles with a built-in fan and/or LED lighting. The disclosed systems may include one or more UV-C light sources which irradiate contaminants as air flows through the UV-C unit. The UV-C unit is mounted on either a universal mounting mechanism or a mobile support unit to provide mobility to the UV-C unit.

A purification dehumidifier includes a housing, a fan, a dehumidifier assembly, and a purifier assembly. The housing includes an air inlet, a dehumidified air outlet, and a purified air outlet. An air duct in communication with the air inlet, the dehumidified air outlet, and the purified air outlet is formed in the housing. The fan is arranged in the air duct and configured to introduce an airflow into the air duct from the air inlet and blow the airflow in the air duct out from at least one of the dehumidified air outlet or the purified air outlet. The dehumidifier assembly is arranged in the air duct and corresponding to the dehumidified air outlet. The purifier assembly is arranged in the air duct and corresponding to the purified air outlet.

A purification dehumidifier includes a housing, a fan, a dehumidifier assembly, and a purifier assembly. The housing includes an air inlet, a dehumidified air outlet, and a purified air outlet. An air duct in communication with the air inlet, the dehumidified air outlet, and the purified air outlet is formed in the housing. The fan is arranged in the air duct and configured to introduce an airflow into the air duct from the air inlet and blow the airflow in the air duct out from at least one of the dehumidified air outlet or the purified air outlet. The dehumidifier assembly is arranged in the air duct and corresponding to the dehumidified air outlet. The purifier assembly is arranged in the air duct and corresponding to the purified air outlet.

An air cleaner including a thermoelectric module includes a blowing fan, a filter, and a thermoelectric module, so it is possible to generate cold air or hot air and perform air purification.

A fluid treatment apparatus including a photocatalyst filter having a first surface and a second surface, a light source unit spaced apart from the photocatalyst filter to provide light to the first surface, a housing including an inlet, an outlet, and a flow path formed between the photocatalyst filter and the light source, and a guide member disposed at one side of the housing and including at least one slat to guide a movement direction of a fluid, in which the slat is inclined at least in a direction closer to the first surface of the photocatalyst filter along an advancing direction of the flow path when an air flow rate of the fluid has a first value, and in a direction away from the first surface of the photocatalyst filter along the advancing direction when the air flow rate of the fluid is greater than the first value.

In various examples, the subject matter of this disclosure relates to devices, systems, and methods for air purification systems. According to one embodiment, a multi-filtration air purification system can include a photocatalytic oxidizer (PCO) filter including an ultraviolet (UV) emitter, the PCO filter disposed within an air filter receiving region of the air purification system. In one implementation, the air purification system can include a removable air filter disposed over the PCO filter and located within the air filter receiving region, where the removable air filter can include a switch trigger. In some instances, the air filter receiving region can include a switch configured to receive the switch trigger, where the switch and switch trigger together are configured to disable operation of the air purification system when the removable air filter is removed from the air filter receiving region.

First and second towers may discharge air. An airflow guide or converter may change a direction of the air discharged from the first tower and the second tower by moving a gate inside and outside of at least one of the first or second towers so as to block discharged air flowing forward and selectively facilitate an upward air flow. The airflow converter may include a guide motor to provide a driving force, the gate, which may reciprocate between the inside and the outside of the first and/or second towers; and a board guider connected to the gate to transmit a driving force of the guide motor to the gate as a linear motion force.

An air cleaner capable of removing bacteria and viruses. The air cleaner includes: a main body including a suction hole through which air is introduced and a discharge hole through which air is discharged; an ultraviolet (UV) irradiation device disposed between the suction hole and the discharge hole, and including a UV light emitting diode (LED) configured to transmit ultraviolet rays toward the discharge hole; a photocatalyst filter including a photocatalyst provided to generate active oxygen by reacting with the UV rays transmitted from the UV LED, and disposed between the UV irradiation device and the discharge hole; and a light blocking member disposed between the UV LED and the suction hole to prevent the UV rays transmitted from the UV LED from being emitted to an outside of the main body through the suction hole.

An air cleaner capable of removing bacteria and viruses. The air cleaner includes: a main body including a suction hole through which air is introduced and a discharge hole through which air is discharged; an ultraviolet (UV) irradiation device disposed between the suction hole and the discharge hole, and including a UV light emitting diode (LED) configured to transmit ultraviolet rays toward the discharge hole; a photocatalyst filter including a photocatalyst provided to generate active oxygen by reacting with the UV rays transmitted from the UV LED, and disposed between the UV irradiation device and the discharge hole; and a light blocking member disposed between the UV LED and the suction hole to prevent the UV rays transmitted from the UV LED from being emitted to an outside of the main body through the suction hole.