An air conditioner includes a housing that defines an air inlet and an air outlet, a heat exchanger, a blowing fan inside the housing, a lower guide configured to guide, toward the air outlet, air discharged to a rear side of the blowing fan and a lower side of the blowing fan, and an upper guide that is disposed vertically above the lower guide and that defines a discharge flow path with the lower guide. The discharge flow path extends from the blowing fan to the air outlet, and a cross sectional area of the discharge flow path increases toward the air outlet. The upper guide defines a curved surface that is disposed at a downstream end of the upper guide adjacent to the air outlet and that is convex toward the air outlet.

A round or rectangular ceiling diffuser includes a blade. The blade includes a leading edge configured to face an incoming air flow and having an undulated contour extending along a closed-loop formed by the blade. The blade also includes a trailing edge opposite to the leading edge, where a width of the blade extends from the leading edge to the trailing edge and the undulated contour extends into and out of the width.

A plenum slot diffuser is configured to receive an air flow and includes a blade configured to guide the air flow toward a space to condition the space. The blade includes a length along which a leading edge of the blade extends, where the leading edge is configured to face an air flow. The blade also includes a width extending transverse to the length between the leading edge and a trailing edge of the blade, and including a curved profile extending along a majority of the width. The blade also includes an undulated contour extending along the leading edge and into and out of the width.

An air conditioner includes a heat exchanger for exchanging heat with air brought into a housing, and a blower fan for blowing air that has exchanged heat with the heat exchanger out of the housing, and controls a guide unit that opens or closes part of an outlet provided in the housing to blow out various flows of air.

Embodiments of the present technology are directed to air treatment reactor modules, and associated systems and devices. An exemplary reactor module can include a housing, an ultraviolet (UV) light source disposed within the housing, and a plurality of hollow elongate conduits disposed within the housing and peripheral to the UV light source. The UV light source and individual conduits can extend in a lateral direction perpendicular to the direction of air flow through the reactor module. The conduits can include a plurality of holes and be at least partially coated with a photocatalytic material. The housing can have an inner surface comprising a reflective material that, in operation, reflects UV light emitted from the UV light source.

An air redirect apparatus for redirecting forced air through a register access cavity. The air redirect apparatus includes a duct elbow configured to fit into a register access cavity. The duct elbow includes an entrance aperture and an exit aperture. The entrance aperture is sized to connect to a duct opening of ductwork, which routes forced air into the register access cavity. The apparatus also includes a cover plate connected to the entrance aperture and through which the entrance aperture penetrates. The cover plate is sized to cover the duct opening of the ductwork when the entrance aperture is connected to the duct opening. When the duct elbow is fit into the register access cavity, air flow from the ductwork is routed into the entrance aperture and directed out of the exit aperture of the duct elbow, while the cover plate substantially blocks air flow around the duct elbow.

An outlet vent airflow directing apparatus. The airflow directing apparatus may have a flexible body with elastic peripheral edges. In use, the elastic peripheral edges may engage all but one side or portion of outlet vent, wherein the unengaged peripheral edge forms an opening between the flexible body and the outlet vent through which directed air flows.

A linear bar diffuser includes a grille frame and blades in a stacked arrangement within the grille frame such that space is provided between adjacent blades to facilitate flow of an incoming air flow therethrough. One of the blades includes a leading edge configured to face the incoming air flow, the leading edge including an undulated contour extending along a length of the blade and into a width of the blade, the width of the blade extending transverse to the length and between the leading edge and a trailing edge of the blade.

Disclosed is a ceiling type air conditioner that can implement a horizontal air flow to provide an indirect wind to a user with a simple structure. To this end, the ceiling type air conditioner according to the present disclosure includes an inner case in which a blower and a heat exchanger are built-in, and a blow passage for guiding air passed through the heat exchanger downward is formed; an inner flow path body which is disposed below the inner case and has a suction flow path for sucking air into the inner case so as to communicate vertically; and an outer flow path body which is spaced outward from the inner flow path body and disposed below the inner case, and forms a discharge flow path, between the inner flow path body, communicating with the blow passage; wherein an outer circumferential surface of the inner flow path body comprises a first concave portion formed to be concave, a first horizontal portion extended horizontally outwardly from a lower end of the first concave portion, and a vertical portion extended vertically downwardly from an outer end of the first horizontal portion.

An air return duct and air return duct grille for a chiller in an aircraft galley has articulated slats that are biased to open during chilling cycles and close during defrost cycles. In the closed orientation, the articulated slats divert any condensate from the chiller to a collection hose; in the open orientation, the articulated slates allow unrestricted airflow. The articulated slats may include a passive biasing element to bias the articulated slats into an open or closed orientation as necessary. The air return duct may also include air return duct grills without articulated slates to allow unobstructed air flow when the articulated slats are in a closed orientation.