Fabric drop-down diffusers are disclosed. An example drop-down diffuser includes an upper panel including an upper fabric sheet to be held in radial tension by an upper hoop. The upper panel defines a supply air inlet. The example drop-down diffuser further includes a lower panel to be underneath and spaced apart from the upper panel. The example drop-down diffuser also includes a circumferential fabric sheet to encircle the upper panel and the lower panel. The circumferential fabric sheet is to extend downward from the upper panel to the lower panel to define an air chamber bordered by the upper panel, the lower panel and the circumferential fabric sheet. The air chamber is connected in fluid communication with the supply air inlet.

An inductive-humidification and evaporative-cooling ventilation system comprising: means for generating a flow of air; a channel for conveying said flow of air, said channel comprising a plurality of inductive holes for transferring said flow of air into the environment, said channel further comprising at least one outflow mouth for expelling said flow of air, which has a three-dimensional structure open both at the back and at the front, and a fluid-thread straightener set at the rear end of said at least one outflow mouth, which recalls a flow of air from the environment surrounding said channel; and at least one humidification device for introducing nebulised water into the environment; wherein said at least one humidification device is set within said at least one diffusion mouth, and said plurality of holes are arranged in a number of rows aligned longitudinally along the ducts.

An air filtration system is provided. The system includes one or more air delivery pipes disposed above, and in fluid communication with, an occupiable space. The delivery pipe supplies clean air to the space through a plurality of air apertures disposed along a length of the air delivery pipe. The apertures are configured to provide a flow of air out of the air delivery pipe that is constant along the length of the air delivery pipe. A similar one or more air exhaust pipes are disposed below, and in fluid communication with, the occupiable space.

A diffuser assembly includes a housing that defines an internal chamber having an open end, a return air outlet, and a supply air inlet; a cover sized to cover the open end, wherein the cover defines a return air inlet and a supply air outlet; and an internal return air duct longitudinally extending within the internal chamber and connecting the return air inlet and the return air outlet, wherein the internal return air duct includes an inner duct surface that defines a return air chamber within the internal return air duct and an outer duct surface that defines a supply air chamber between the housing and the outer duct surface, wherein the supply air chamber defines a supply air path between the supply air inlet and the supply air outlet.

A pneumatic radiation air conditioner includes: a radiation unit configured to radiate air-conditioning air; and a fan configured to feed the air-conditioning air to the radiation unit. The radiation unit includes: a first chamber, through which the air-conditioning air flows; a second chamber configured to take in the air-conditioning air discharged from the first chamber and discharge the air-conditioning air and radiate heat of the air-conditioning air to a space to be air conditioned; and an air stream adjuster configured to adjust air velocity distribution and air volume distribution of the air-conditioning air that is discharged from the first chamber to the second chamber.

Fabric drop-down diffusers are disclosed. An example drop-down diffuser includes a first fabric sheet. The first fabric sheet is to extend away from a ceiling at a location adjacent a supply inlet. The supply inlet is to provide a flow of air toward the first fabric sheet. The example drop-down diffuser also includes a blanking sheet to restrict air flow through the first fabric sheet. The blanking sheet is to be disposed on an interior surface of the first fabric sheet. The blanking sheet has a lower permeability than the first fabric sheet.

An air conditioning diffuser assembly includes an air intake member mounted on an elongate upper member formed with an opening to let air pass through from the air intake member. A corner panel extends at a non-zero angle from the elongate upper member. A first corner mounting panel extends from the corner panel. A second corner mounting panel extends from the elongate upper member. Ends of the first and second corner mounting panels are separated by an elongate gap. A diffuser is mounted inside the air conditioning diffuser assembly. A bottom edge of the diffuser is mounted at a juncture between the corner panel and the first corner mounting panel and a top edge of the diffuser is mounted at a juncture between the elongate upper member and the second corner mounting panel.

An air-conditioning apparatus includes a body, a decorative panel attached to a lower surface of the body defining a lower surface of the air-conditioning apparatus, an air-inlet grille that can rotate to open and close and is attached to an air inlet of the decorative panel, and a shaft disposed on the decorative panel. The shaft is movable along an axis of rotation of the air-inlet grille. The shaft includes a shaft body, a pivot protruding from one end face of the shaft body in a moving direction of the shaft, and a rib extending parallel to the pivot. The air-inlet grille has a mating portion into which the pivot is inserted to support rotation of the air-inlet grille. The pivot engages the air-inlet grille at a first limit of a movable range of the shaft. The rib engages the decorative panel while the pivot is fitted in the mating portion.

A diffuser assembly includes a housing that defines an internal chamber having an open end, a return air outlet, and a supply air inlet; a cover sized to cover the open end, wherein the cover defines a return air inlet and a supply air outlet; and an internal return air duct longitudinally extending within the internal chamber and connecting the return air inlet and the return air outlet, wherein the internal return air duct includes an inner duct surface that defines a return air chamber within the internal return air duct and an outer duct surface that defines a supply air chamber between the housing and the outer duct surface, wherein the supply air chamber defines a supply air path between the supply air inlet and the supply air outlet.

A system for use with a manhole vault having an internal atmosphere, and, optionally, with a ventilation stack connecting the vault to an external atmosphere. The system includes a manhole cover, a ventilation pipe, and an air moving assembly. The cover has one or more through-holes extending between top and bottom surfaces. Each of the through-hole(s) is in fluid communication with the external atmosphere at the top surface. The pipe has a through-channel that extends between first and second openings. The first opening is positioned proximal to either an opening into the ventilation stack or at least one of the through-hole(s) at the bottom surface of the cover. The second opening is positioned in the interior of the vault. The device is configured to cause a portion of one of the interior and external atmospheres to flow through the through-channel toward a different one of the interior and external atmospheres.