A self-cleaning air filter assembly is provided and includes a filter housing having an upper portion and a lower portion that together define an internal volume. An air filter element is disposed in the internal volume. The upper portion of the filter housing includes a canister port adapted for fluid connection with an evaporative emissions canister. The lower portion of the filter housing includes a first port adapted for fluid connection with an atmospheric vent, and a second port adapted for fluid connection with a source of low pressure air. During a cleaning mode, air is pulled from the first port and along the filter element to the second port in order to remove particulate matter from the filter element. A vehicle evaporative emissions control system including the air filter assembly and a method of cleaning an air filter assembly are also provided.

A self-cleaning air filter assembly is provided and includes a filter housing having an upper portion and a lower portion that together define an internal volume. An air filter element is disposed in the internal volume. The upper portion of the filter housing includes a canister port adapted for fluid connection with an evaporative emissions canister. The lower portion of the filter housing includes a first port adapted for fluid connection with an atmospheric vent, and a second port adapted for fluid connection with a source of low pressure air. During a cleaning mode, air is pulled from the first port and along the filter element to the second port in order to remove particulate matter from the filter element. A vehicle evaporative emissions control system including the air filter assembly and a method of cleaning an air filter assembly are also provided.

Cleanable filters and methods of cleaning filters are described in the present application. The cleanable air filter includes a housing and a filter element installed in the housing. The filter element is configured to filter an operating fluid in a given application. The filter element is cleanable in-situ in the installed condition in the housing. The cleanable air filter further includes a cleaning fluid applicator configured to apply a cleaning fluid to the filter element while the filter element is in the installed condition in the housing such that the filter element is cleanable without being removed from the filter housing.

An air purifier is provided. The air purifier according to an exemplary embodiment includes a body including an air inlet and an air outlet, an air blowing unit disposed in an inside of the body, the air blowing unit being configured to forcibly introduce outside air into the inside of the body through the air inlet and discharge air into the air outlet, a filter unit rotatably disposed between the air blowing unit and the air inlet, a driving motor configured to rotate the filter unit, and a cleaning member detachably connected to a vacuum cleaner and disposed in proximity to the filter unit to guide contaminants adhering to the filter unit to be flown into the vacuum cleaner.

A changeover valve includes: a valve body and an internal-communication air duct and a driving device arranged in the valve body; wherein the valve body is connected with a housing of a vacuum cleaner, the housing is provided with a ventilation opening, an air inlet duct for driven inlet air and an air outlet duct for driven outlet air, the ventilation opening is provided with a filter element, a first end of the internal-communication air duct is connected with the ventilation opening, an outer side of the internal-communication air duct is connected with the driving device, so that the driving device drives a second end of the internal-communication air duct to rotate by a preset angle, the second end of the internal-communication air duct is connected at the air inlet duct and the air outlet duct communicates with the external space.

A changeover valve includes: a valve body and an internal-communication air duct and a driving device arranged in the valve body; wherein the valve body is connected with a housing of a vacuum cleaner, the housing is provided with a ventilation opening, an air inlet duct for driven inlet air and an air outlet duct for driven outlet air, the ventilation opening is provided with a filter element, a first end of the internal-communication air duct is connected with the ventilation opening, an outer side of the internal-communication air duct is connected with the driving device, so that the driving device drives a second end of the internal-communication air duct to rotate by a preset angle, the second end of the internal-communication air duct is connected at the air inlet duct and the air outlet duct communicates with the external space.

A filter assembly for a gas turbine system includes a filter element configured to remove entrained particles from air which passes through the filter element in a first direction toward a central air passageway. A motion generator arranged to rotate the filter element about a longitudinal axis extending in an airflow direction of the air passageway to cause particles accumulated on the filter element to fall downwardly away from the filter element due to gravity.

A filtration system includes a rotary drum and a media holding band that is configured to hold a filtration media on an outer surface of the rotary drum. The media holding band includes a strap and a connector. The strap includes a first end and a second end opposite the first end. The connector is configured to secure the first end of the strap relative to the second end of the strap.

A system, method, and apparatus for ameliorating deposits in selective catalytic reduction systems for the reduction of nitrogen oxide emissions in steam methane reformers. The system includes positioning a dual stage refractory particulate (RP) filter placed in an upstream airflow from a Selective Catalytic Reduction System (SCRS). The first stage is formed of a perforated steel plate with a second stage formed of a wire mesh screen. The system may employ air cannons to clean each of the first stage and the second stages.

A system, method, and apparatus for ameliorating deposits in selective catalytic reduction systems for the reduction of nitrogen oxide emissions in steam methane reformers. The system includes positioning a dual stage refractory particulate (RP) filter placed in an upstream airflow from a Selective Catalytic Reduction System (SCRS). The first stage is formed of a perforated steel plate with a second stage formed of a wire mesh screen. The system may employ air cannons to clean each of the first stage and the second stages.