Abstract: A framed air filter including a pleated filter element with two opposing primary, corrugated edges and with two opposing secondary, non-corrugated edges. The pleated filter element bears two edge seals of hardened adhesive that are positioned proximate, and laterally inward from, each primary, corrugated edge. The framed air filter includes a perimeter seal that is made of hardened adhesive and that is disposed on the first side of the pleated filter element. The frame of the framed air filter may be a flattenable-as-made frame.

Abstract: A powered room air purifier including a non-movable air filter holder. The room air purifier may include at least one guide ramp located at an upper end of the air filter holder. An air filter may be installed into the air filter holder by a combination of translational and rotational movement of the air filter.

Abstract: A conformable, unframed pleated air filter, comprising a plurality of bridging filaments on at least one face of the pleated air filter.

Abstract: A pleated filter media comprising front pleats and rear pleats, with at least some of the front pleats having junctions at which local areas of adjoining front pleat walls of the front pleat are frontally joined together. The junctions may be at discrete locations that are spaced along a pleat direction of the front pleats. For any two nearest-neighbor front pleats, the junctions of one of the front pleats may be offset, along the pleat direction, from the junctions of the other front pleat.

Abstract: A powered room air purifier with a visual indicator of air quality, the visual indicator including: a reflector that defines a forwardly-open-ended reflecting cavity and that includes at least one through-opening in a floor or ceiling of the reflector; at least one diffuser layer that covers the forward opening of the forward-open-ended reflecting cavity; and, at least one LED light source that is positioned within the at least one through-opening, the LED light source and the reflector being configured so that the LED light source is shielded from line-of-sight view along a forward-rearward axis of the powered room air purifier.

Abstract: A disposable, annular, unframed, pleated air filter that is in a compacted shape and is openable to a generally cylindrical, ready-for-use shape. The air filter comprises a length of pleated air filter media and at least one adhesive strand, and comprises first and second preferred-bending zones at which the at least one adhesive strand is interrupted.

Abstract: A conformable, unframed pleated air filter, comprising a plurality of bridging filaments on at least one face of the pleated air filter.

Abstract: A room air purifier including upper and lower portions. The upper and lower portions may include integrated resilient upper and lower gaskets configured so that with an air filter removably installed in the room air purifier and with the upper and lower portions attached to each other, the upper and lower portions apply pressure to the air filter through the upper and lower gaskets.

Abstract: A room air purifier including upper and lower portions with the lower portion including a detachable floor panel. The upper portion and the floor panel may respectively include integrated resilient upper and lower gaskets configured so that with an air filter removably installed in the room air purifier and with the floor panel attached to a lower housing piece of the lower portion of the room air purifier, the upper portion of the room air purifier, and the floor panel, apply pressure to the air filter through the upper and lower gaskets.

Abstract: The present disclosure relates to air filters. More particularly, it relates to air filters including pleated filter media that can be uniformly expanded and contracted. In some embodiments, the air filters are adjustably sized air filter systems. In some embodiments, the air filters can be used in a window opening.

Abstract: A room air purifier including first and second portions. The first portion includes a locking ring and the second portion includes a mandrel configured to receive an unframed air filter. The locking ring can be secured to the mandrel to join the first and second portions to each other to form the room air purifier.

Abstract: A powered room air purifier with a visual indicator of air quality, the visual indicator including: a reflector that defines a forwardly-open-ended reflecting cavity and that comprises at least one through-opening in a floor or ceiling of the reflector; at least one diffuser layer that covers the forward opening of the forward-open-ended reflecting cavity; and, at least one LED light source that is positioned within the at least one through-opening, the LED light source and the reflector being configured so that the LED light source is shielded from line-of-sight view along a forward-rearward axis of the powered room air purifier.

Abstract: Computer-implemented systems and methods for estimating a replacement status of an HVAC air filter. Outdoor weather data (e.g., outdoor temperature information), is obtained. A Total Runtime Value of the HVAC system is determined based upon the obtained outdoor weather data. Finally, a replacement status of the air filter is estimated as a function of a comparison of the Total Runtime Value with a Baseline Value. By correlating air filter replacement status with an estimated runtime of the HVAC system, a credible predictor of air filter usage is provided. By estimating fan runtime based on easily-obtained outdoor weather data, the methods are readily implemented with any existing HVAC system and do not require installation of sensors or other mechanical or electrical components to the HVAC system.

Abstract: A powered room air purifier including a non-movable air filter holder. The room air purifier may include at least one guide ramp located at an upper end of the air filter holder. An air filter may be installed into the air filter holder by a combination of translational and rotational movement of the air filter.

Abstract: Filter assemblies are described. In particular, a filter securement assembly for receiving and retaining a filter media in an exhaust hood is disclosed, the filter securement assembly being releasably securable to the exhaust hood, includes a filter frame, a cover and a face forming a portion of the cover, the face defining a plurality of apertures therethrough, the apertures forming at least 50% of a face surface area.

Abstract: A single-layer spunbonded air-filtration web including meltspun autogenously bonded electret fibers with an Actual Fiber Diameter of from 3.0 microns to 9.0 microns. The air-filtration web exhibits a mean flow pore size of from 8.0 to 19 microns and exhibits a ratio of mean flow pore size to pore size range of from 0.55 to 2.5. Also disclosed are methods of making such webs, and methods of using such webs to perform air filtration.

Abstract: A single-layer spunbonded air-filtration web including meltspun autogenously bonded electret fibers with an Actual Fiber Diameter of from 3.0 microns to 15 microns. The air-filtration web exhibits a ratio of mean flow pore size to pore size range of from 0.55 to 2.5. Also disclosed are methods of making such webs, and methods of using such webs to perform air filtration.

Abstract: An air filter media (10) including a pleated fibrous filtration web (8) with a first major side (2) that includes at least one sorbent-loaded area (26) in which sorbent particles (14) are present on a first major surface (25) of the pleated fibrous filtration web (8), at least some of the sorbent particles (14) being post-pleat-deposited sorbent particles.

Abstract: Computer-implemented systems and methods for estimating a replacement status of an HVAC air filter. Outdoor weather data (e.g., outdoor temperature information), is obtained. A Total Runtime Value of the HVAC system is determined based upon the obtained outdoor weather data. Finally, a replacement status of the air filter is estimated as a function of a comparison of the Total Runtime Value with a Baseline Value. By correlating air filter replacement status with an estimated runtime of the HVAC system, a credible predictor of air filter usage is provided. By estimating fan runtime based on easily-obtained outdoor weather data, the methods are readily implemented with any existing HVAC system and do not require installation of sensors or other mechanical or electrical components to the HVAC system.

Abstract: The present disclosure relates to air filters. More particularly, it relates to air filters including pleated filter media that can be uniformly expanded and contracted. In some embodiments, the air filters are adjustably sized air filter systems. In some embodiments, the air filters can be used in a window opening.