A vacuum cleaner filtration system having a primary separation system and a filter downstream of the primary separation system. The filter has an upstream side to receive an airflow exiting the primary separation system, and a downstream side fluidly opposite the upstream side. The system has a vacuum fan, a primary suction path between the filter's downstream side and the vacuum fan, a valve in the primary suction path and configured to selectively position to block the primary suction path and create a closed passage at the filter's downstream side, and a secondary suction path between the filter's upstream side and the vacuum fan. A secondary filtration system is in the secondary suction path to separate dirt from an airflow passing therethrough, to thereby clean dirt from the filter's upstream side. A nozzle may be provided to concentrate the air flow as it enters the secondary suction path.

Air filtration apparatuses, systems and methods for nitrous oxide and volatile organic compound (VOC) removal and non-VOC particle removal enable the removal of particulates, nitrous oxide-containing compounds, and volatile organic compounds from large volume enclosed environments. Systems incorporate HEPA filtration upstream from UV LED-assisted photo reaction chamber comprising a plurality of baffles having air flow-through airflow spaces are spaced apart along a duct, with a porous and permeable nitrous oxide-adsorbing filter oriented downstream from the UV-assisted photo reaction chamber further filtering the airflow in the system to remove nitrous oxide-containing compounds.

A dust collector cools a controller. The dust controller includes a body housing, a motor located inside the body housing, a fan rotatable by the motor, a controller that controls the motor, and a thermal insulator between the motor and the controller. The thermal insulator defines a flow channel through which an airflow generated by the fan passes.

A dust collector cools a controller. The dust controller includes a body housing, a motor located inside the body housing, a fan rotatable by the motor, a controller that controls the motor, and a thermal insulator between the motor and the controller. The thermal insulator defines a flow channel through which an airflow generated by the fan passes.

The invention discloses a dust detection method and system and a signal processing unit thereof to detect the dust in the net gas output by different gas-solid separation units. The method according to the invention comprises a signal acquisition section acquiring the target signal with the dust detection components arranged at the net gas output sides of different gas-solid separation units, a signal transmission section transmitting the target signal acquired by the signal acquisition section, and a signal processing section receiving and processing the target signal transmitted by the signal transmission section and outputting the detection results; the dust detection components of the signal acquisition section are arranged on the confluence channel that is connected with the net gas output sides of the different gas-solid separation units, and are respectively arranged behind the connection points on the confluence channel for connecting with the net gas output sides of the different gas-solid separation units.

The invention discloses a dust detection method and system and a signal processing unit thereof to detect the dust in the net gas output by different gas-solid separation units. The method according to the invention comprises a signal acquisition section acquiring the target signal with the dust detection components arranged at the net gas output sides of different gas-solid separation units, a signal transmission section transmitting the target signal acquired by the signal acquisition section, and a signal processing section receiving and processing the target signal transmitted by the signal transmission section and outputting the detection results; the dust detection components of the signal acquisition section are arranged on the confluence channel that is connected with the net gas output sides of the different gas-solid separation units, and are respectively arranged behind the connection points on the confluence channel for connecting with the net gas output sides of the different gas-solid separation units.

A laundry appliance uses a determination of a frequency of compressor temperature response, refrigerant mass flow rate, or both to determine accumulation of lint in a filter. Based on the determination, various corrective actions can be taken including notifying the user, shutting off the appliance, initiating an automatic cleaning sequence for one or more lint filters, and combinations thereof.

This present application discloses use of a hydrogen peroxide solution for a filter media cleaning and sanitizing system which is designed to dispense the solution to disinfect an air filter. The system is attached to an existing air filter, allowing the system to lightly mist the filter media with the solution. The invention also adjusts the ions in the air system to eradicate germs, bacteria, viruses, and other airborne pathogens, and functions as a sanitization method for any type of air or HVAC system.

Hygiene regulations and social distancing are very effective in blocking short distance infections. During the lockdown, the distance rules can usually be adhered to, but what happens when the actual lockdown is over and the people meet again in a confined space? Then additional effective and efficient protection is essential to stabilize infection rates. Since the viruses are spread by contact and droplet infection, technical devices are required that effectively intervene in the chain of infection and effectively block infection. An effective protection is the respiratory mask as known since 100 years. An alternative to mask is an aerosol protection system for various applications in environment. The protection system consists of adjustable air sucking device and air blowing device in different form factors based on application. The aerosol protection system uses either an air curtain or air shield to prevent the aerosol going from one side of the curtain or shield to the other side.

A method for removing exhaust gas from a bioreactor (3) and a bioreactor system. The method comprises the steps of: —providing at least one exhaust filter (15; 115a, 115b) connected to an outlet (7) of the bioreactor (3) for transferring exhaust gas out from the bioreactor; —increasing a pressure at an inlet side (25) of the at least one exhaust filter (15; 115a, 115b) in a connection (16) between the bioreactor (3) and the at least one exhaust filter (15; 115a, 115b) or decreasing a pressure at an outlet side (23) of the at least one exhaust filter (15; 115a, 115b).