An air filter assembly includes a filter element having at least one variable dimension, and a frame for engaging and supporting the filter element. The frame may include a plurality of linear segments forming a rectangular configuration, and a plurality of clips for connecting the linear segments together at corners thereof. The linear segments may be L-channel segments, C-channel segments, or may be of other form. Clips may be used for connecting the linear segments together at the corners. The filter element may have a pattern of creases or fold lines to facilitate folding thereof from an expanded configuration to a reduced configuration. A grate may be included for spanning an area bounded by the frame to support the filter element. The grate may have multiple arms and a central hub. An edge treatment may form a seal between the filter element and the frame.

An air filter assembly includes a filter element having at least one variable dimension, and a frame for engaging and supporting the filter element. The frame may include a plurality of linear segments forming a rectangular configuration, and a plurality of clips for connecting the linear segments together at corners thereof. The linear segments may be L-channel segments, C-channel segments, or may be of other form. Clips may be used for connecting the linear segments together at the corners. The filter element may have a pattern of creases or fold lines to facilitate folding thereof from an expanded configuration to a reduced configuration. A grate may be included for spanning an area bounded by the frame to support the filter element. The grate may have multiple arms and a central hub. An edge treatment may form a seal between the filter element and the frame.

An improved device for collecting particulate matter suspended in the ambient air is disclosed comprising a container extending between an open first end and a closed second end defining a container interior. A container output communicates with a container interior located proximate the closed second end of the container. A filter cassette comprising a collection filter is permanently affixed to a filter holder. A retainer having a retainer input retains the filter cassette between the retainer input and the container output. An output connector connects the container output to a low pressure source for drawing ambient air into the retainer input for enabling the collection filter to collect particulate matter suspended in the ambient air entering the retainer input. Preferably, the filter holder and the filter are disposable.

A filter assembly having a filter module, a fan module, an electronics module including a control system. The fan module inlet and the filter module outlet are laterally spaced apart with their corresponding surfaces extending side by side. A cover is movable between an engaged position engaging the surfaces of the filter and fan modules and a removed position. The cover defines a plenum providing a fluid communication between the filter module outlet and the fan module inlet in the engaged position and directing the flow along a direction different from a direction of the flow through the fan module inlet and filter module outlet. A sensor is located in the plenum and configured to provide information on the flow through the plenum. The sensor communicates with a power source and with the control system at least when the cover is in the engaged position.

A filter element has, on a filter element housing, a first and a second filter medium body, which are arranged at an angle to each other.

A filter element, including: a first filter media body having a filter media and an inflow side and an outflow side; and a second filter media body having a filter media and an inflow side and an outflow side; wherein the first filter media body and the second filter media body are adapted for installation into a filter element housing shared by both filter media bodies; wherein the filter element has a longitudinal axis; wherein the filter media bodies in the filter element housing delimit a common clean chamber shared by both filter media bodies, the common clean chamber from which the cleaned fluid is to be discharged via at least one outflow aperture; wherein at least one of the filter media bodies is constructed from at least two sections, each section differing in size from other sections.

The invention relates to a method for producing a contoured filter element, according to which method at least one filtering medium is applied to a flat backing material and is detachably secured thereto. The filtering medium is cut out on the backing material to form the contoured filter element and said contoured filter element can be detached from the backing material for use. The invention also relates to a filter element arrangement produced by means of this method.

A filter assembly including a plurality of filter modules, wherein each filter module in the plurality of filter modules includes a frame, a filtration element coupled within the frame, and at least one mating feature. The at least one mating feature of each filter module is configured for selective engagement with the at least one mating feature of another filter module such that the plurality of filter modules are coupled together in a serial arrangement.

A filter assembly for a heat exchanger unit having a pliable body made of a filter medium. The filter assembly has a first end extending from an inner region through a middle portion to an outer perimeter end, and a second end extending from the inner region through the middle portion to the outer perimeter end. The second end is configured for coupling with the first end. The assembly has a central opening, and a mount insert coupled with the pliable body in the central opening.

The present disclosure relates to an air cleaner with an improved locking structure. The air cleaner includes a cabinet, a panel having a plurality of holes for discharging air to the front of the cabinet and detachably mounted on the cabinet, and a locking device to detachably connect the cabinet and the panel, wherein the locking device includes a first locking member disposed on the panel, and a second locking member disposed in the cabinet to lock or unlock the first locking member by being rotated by pressing of the first locking member.