A filter device and a filter system are provided. A magnetic unit is disposed on at least one side of the filter device. The filter device includes a filter and a magnetic fixing device. The filter includes a first side wall. The magnetic fixing device includes a body, a clipping portion, and the magnetic unit. The body includes a top edge, a bottom edge, a first side face, and a second side face opposite to the first side face. The clipping portion includes a top flange extending from the top edge along the facing direction of the first side face by a first distance and a clip plate extending from an outer edge of the top flange toward the bottom edge by a second distance. The first side wall is clipped between the clip plate and the first side face. The magnetic unit is disposed on the second side face. The filter system includes a frame and the filter device.

Articles and methods involving filter media are generally provided. In certain embodiments, the filter media includes at least a first layer, a second layer, and an adhesive resin positioned between the first layer and the second layer. In some embodiments, the first layer may be a pre-filter layer or a support layer. The second layer may, for example, comprise fibers formed by a solution spinning process and/or may comprise fine fibers. In some embodiments, the adhesive resin may be present in a relatively low amount and/or may have a low glass transition temperature. The filter media as a whole may have one or more advantageous properties, including one or more of a high stiffness, a high bond strength between the first layer and the second layer, a high gamma, and/or a low increase in air resistance after being subjected to an IPA vapor discharge. The filter media may be, for example, a HEPA filter and/or an ULPA filter.

A HEPA/VOC air handling system is disclosed. It has a HEPA air filtration unit and an air handling unit. The HEPA air filtration unit has a fresh air intake, an inside air intake, a pre-filter unit, a HEPA air filter, and HEPA fan. The HEPA fan draws fresh air and inside air into a HEPA chamber to form combined air that moderates the fresh air toward the inside air's temperature and humidity to inhibit shocking or damaging the components in the HEPA air filtration unit. The combined air passes through the pre-filter unit and then the HEPA air filter to form HEPA filtered combined air. The air handling unit has a HEPA filtered combined air intake, a return air intake, an air handling device fan, and a supply outlet wherein the HEPA filtered combined air mixes with the return air to (A) form mixed air and (B) further moderate the HEPA filtered combined air toward the return air's temperature and humidity to inhibit shocking or damaging the components in the air handling device, and the rooms that receive the mixed air.

Cleanroom particle capture systems and cleanroom workstations include a duct carrying a particle capture air stream. A fan and a particle filter are arranged at the first end of the duct with at least some of the particle capture air stream passing through the filter, wherein the particle capture airstream has a first air velocity at the filter. A blow off device provides a blow off airstream into the duct at a second end of the duct, with the blow off airstream having a second air velocity at the second end that is higher than the first air velocity. The duct has one or more intervening features to reduce the second air velocity such that it substantially matches the first air velocity when the blow off airstream reaches the filter.

Examples of the present disclosure are related to systems and methods for replaceable multiple filter units. More specifically, embodiments describe replaceable filter units that are configured to simultaneously filter fresh and return air.

Articles and methods involving filter media are generally provided. In certain embodiments, the filter media includes at least a first layer, a second layer, and an adhesive resin positioned between the first layer and the second layer. In some embodiments, the first layer may be a pre-filter layer or a support layer. The second layer may, for example, comprise fibers formed by a solution spinning process and/or may comprise fine fibers. In some embodiments, the adhesive resin may be present in a relatively low amount and/or may have a low glass transition temperature. The filter media as a whole may have one or more advantageous properties, including one or more of a high stiffness, a high bond strength between the first layer and the second layer, a high gamma, and/or a low increase in air resistance after being subjected to an IPA vapor discharge. The filter media may be, for example, a HEPA filter and/or an ULPA filter.

Method for detecting compromised zone in cleanroom, including the following steps: (1) cleanroom including air supply space, ceiling, clean space, elevated floor, and return air space that are arranged sequentially from top down, wherein ceiling is divided into plurality of air supply zones, elevated floor is divided into plurality of exhaust zones, air supply zones and exhaust zones are arranged vertically in one-to-one corresponding manner with cylindrical space formed between corresponding two, cleanroom further includes detection mechanisms corresponding, one-to-one, to cylindrical spaces, and detection mechanism includes corrosion test specimen and detection unit; and (2) monitoring electrical parameters of corrosion test specimen of each detection mechanisms, and determining, if electrical parameters of corrosion test specimen of one detection mechanism change continuously in trend, that cylindrical space corresponding to this detection mechanism is compromised zone.

An improved isolation ward structure includes a top portion further comprising a space, a fresh-air pipe, a communication pipe and a an exhaust-connected pipe wherein the space is furnished with an air filtration unit (FFU); an end of the communication pipe is communicated with the fresh-air pipe while its other end is communicated with the air filtration unit (FFU), an end of the exhaust-connected pipe is communicated with the fresh-air pipe; a bedroom being positioned under the air filtration unit (FFU) will let the air which is filtered through the air filtration unit (FFU) enter the bedroom; a bottom portion being positioned under the bedroom has a semi-hermetic space formed by the plurality of elevated honeycomb floors; the air within the bedroom will enter the semi-hermetic space which will let the pathogenic air within the bedroom (10) flow therein via the plurality of honeycomb floors (22) and re-circulate through the air filtration unit (FFU) to be filtered; and a backflow circulation portion being positioned above the semi-hermetic space and below the space with its upper end communicates with the other end of the exhaust-connected pipe; the backflow circulation portion is adjacent to the bedroom for re-circulating the air waited to be filtered within the semi-hermetic space to the fresh-air pipe therein.

A filtering module includes at least one reinforced aluminum side plate and at least one filtering mesh. The reinforced aluminum side plate surrounds to form a rectangular frame. The reinforced aluminum side plate includes a top plate, a connecting plate, a base plate and a positioning plate. The connecting plate is connected between the top plate and the base plate. The base plate and the top plate are substantially parallel with each other. The base plate has a treated surface away from the top plate and configured to abut against a fan filtering unit. The top plate has a supporting surface away from the base plate. The positioning plate is disposed perpendicularly on the supporting plate and aligns with the connecting plate. The filtering mesh is at least partially supported on the supporting surface and at least partially abuts against the positioning plate.

Provided is a filter unit, including a frame fixed along a perimeter of an opening in a wall, a housing connected to the frame to form an inner space, a cover plate installed on the frame to cover the inner space, and a filter box provided with a filter and installed in the inner space.