An air purifying device may comprise: a housing defining an inlet aperture and an outlet aperture; a primary filtration unit positioned within the housing, the primary filtration unit positioned proximate to the inlet aperture and configured to receive air through the inlet aperture for treatment; a secondary filtration unit positioned within the housing, the secondary filtration unit positioned proximate to the outlet aperture and configured to exhaust air through the outlet aperture; a particulate filtration unit positioned within the housing, the particulate filtration unit positioned between the primary filtration unit and the secondary filtration unit, the particulate filtration unit having an aperture that is capable of slidably receiving an ultra-low particle (ULPA) filter via an access opening; wherein an airflow pathway is provided for flow of air from the primary filtration unit to the secondary filtration unit through the particulate filtration unit.

A surface-enhanced copper filter for air purification and a filter assembly with a surface-enhanced copper filter composed, at least in part, of substantially pure copper. The surface-enhanced copper filter uses the anti-microbial and electrostatic properties of elemental copper to inactivate biological contaminants and remove biological contaminants and other pollutants from the air. Also disclosed is a system and method using a filter assembly having a surface-enhanced copper filter to purify air. The disclosed surface-enhanced copper filter can be used in a stationary or mobile HVAC system or in a mobile air purification system.

A system for cleaning a compartment includes a conductive thread incorporated near a surface that has microbes on it. An electric current may flow through the conductive thread to kill the microbes on the surface through low-frequency electromagnetic pulse sterilization of the surface. The conductive trace is also in contact with air in the compartment. The electric current flowing through the conductive trace also ionizes the air within the compartment, which produces charged particles that are removed from the air.

A filter and a filter system including the filter. The filter includes a porous filter frame having a first upstream-side surface, and a second downstream-side surface based on a thickness direction, the porous filter frame filtering particulate matter. A copper material layer is disposed on at least a portion of the first upstream-side surface of the filter frame.

Air purification apparatus is provided that removes undesirable substances, such as particulate materials, malodors, viruses, bacteria, fungi, and toxins, from the air present within an enclosed environment. The apparatus is switchable between a mode in which air immediately adjacent the apparatus housing is drawn in and purified, and a mode in which air remote from the apparatus housing is drawn in from a specific point within the enclosed environment through use of an elongate duct.

An air processing system is disclosed. The system includes a mobile robot, and the robot includes an intake module, the module includes a manifold, a first airfoil disposed on the manifold and configured to allow air of an area designed to have its air cleaned to enter the manifold, a second airfoil disposed one the manifold opposite the first airfoil configured to allow air from the area to enter the manifold, and a collector provided in between the first airfoil and the second airfoil and disposed on the manifold configured to receive air from the manifold and thus filter the air, and the system further includes a controller configured to provide one of remote control and autonomous control of the mobile robot.

The present disclosure delineates both active as well as passive respiratory filtration systems. The respiratory filtration systems are configured to be worn by a user, providing the user protection from the ambient environment, possibly containing microorganisms, pathogens, particulate matter, and the like. The respiratory filtration system is also designed to protect others by filtering the exhalation air released into the environment by the user. The disclosed respiratory filtration system(s) includes one or more hygienic materials. The hygienic materials are carefully selected and disposed at predetermined locations within the respiratory filtration system, so to optimize user to the observer(s) communications, especially the oronasal cover. Optimized communications include the transmission of distortion-free speech and/or unobstructed view of the user's oronasal area, especially the mouth.

This disclosure relates to aggregating, neutralizing, and filtering ultra-fine particles in fluids such as air and water. Fluid may be drawn from an ambient environment into a neutralization chamber. Within the neutralization chamber, particles in the fluid may be agglomerated. An acoustic field may be applied to the fluid to agglomerate the particles. The agglomerated particles may be exposed to light. The light may denature or deactivate the agglomerated particles. The agglomerated and inert particles may be passed through a filter. After agglomeration and neutralization, the fluid may be released back into the ambient environment.

An air purifying breathing system for providing filtered air to a user. The air purifying breathing system comprises a headgear that is not self-contained and is open under a face shield to let air flow out of the headgear. A fan component moves ambient air into the system and across a filtering component. The filtering component comprises a first and second filter, each filter using different filter media. After the air is filtered, it exits the filtering component and into the headgear at the top for distribution to the user. The filtered air flows past the user and out the opening under the face shield. The slight positive pressure from the airflow prevents the inflow of unfiltered air into the headgear. The filtering component may be attached to or integrated into the headgear or may be retained by a vest or harness.

Reusable filters for personal protective equipment (PPE) may prevent shortages of PPE and save fabrication time, resources, and money. Disclosed is a method and system for fabrication of nanofiber filter media for PPE. The method includes positioning a substrate to receive nanofibers thereon, providing a voltage gradient in a region of the substrate, and electrospinning nanofibers onto the substrate. The methods and associated systems allow autoclaving of the filter medium at temperatures of up to 300 degrees for sanitizing the filter medium. Additionally, the methods and associated system allow for the inclusion of an anti-pathogen agent in the nanofiber filter media.