A hygiene management device for an entrance hall is designed to emit far-UV light from upper and lower sides toward a person by reflecting the far-UV light emitted from the upper side to the person's lower body by a reflector located at the lower side, and reflecting the far-UV light emitted from the lower side to the person's upper body by a reflector located at the upper side. Accordingly, a sterilization effect on the person is improved.

An air flow producer assembly includes first and second elongate mounting elements separated by an elongate gap, a ceiling girder interface member affixed to each of the elongate mounting elements, and a bridge member affixed to each of the elongate mounting elements. The bridge member includes a hollow chamber that spans across the gap and which extends upwards from the elongate mounting elements. A vane assembly is installed in the hollow chamber of the bridge member, which includes a vane that swings across at least a portion of the gap.

An air flow producer assembly includes first and second elongate mounting elements separated by an elongate gap, a ceiling girder interface member affixed to each of the elongate mounting elements, and a bridge member affixed to each of the elongate mounting elements. The bridge member includes a hollow chamber that spans across the gap and which extends upwards from the elongate mounting elements. A vane assembly is installed in the hollow chamber of the bridge member, which includes a vane that swings across at least a portion of the gap.

An air discharge device is configured to discharge an air flow. The air discharge device includes a main hole for discharging an air flow as a working air flow, an auxiliary hole provided around the main hole to discharge a support air flow, and a vortex suppression structure configured to suppress development of vortices generated in a velocity boundary layer of the working air flow at a downstream side of an outlet of the main hole. This vortex suppression structure is configured to make a central portion of the thickness of the velocity boundary layer of the working air flow at the downstream side of the outlet of the main hole to be closer to a mainstream of the support air flow, at the downstream side of the outlet of the main hole.

An air discharge device is configured to discharge an air flow. The air discharge device includes a main hole for discharging an air flow as a working air flow, an auxiliary hole provided around the main hole to discharge a support air flow, and a vortex suppression structure configured to suppress development of vortices generated in a velocity boundary layer of the working air flow at a downstream side of an outlet of the main hole. This vortex suppression structure is configured to make a central portion of the thickness of the velocity boundary layer of the working air flow at the downstream side of the outlet of the main hole to be closer to a mainstream of the support air flow, at the downstream side of the outlet of the main hole.

A linear supply outlet system and related devices and methods for efficiently passing air into an indoor space while integrating heating and cooling fenestrations with architectural appearances, comprising: an active register comprising: an active fenestration projection comprising a width thereof no smaller than ⅜″ and no larger than ⅞″, culminating in an airflow opening at a forward extremity of the active register; an active register mounting flange recessed rearward of the airflow opening; and at least one duct connection fabricated to connect with an SDHV duct; and a passive register-connector comprising: a passive fenestration projection comprising a width thereof which is equal to the width of the active fenestration projection, culminating in a dummy opening at a forward extremity of the passive register-connector; a passive register-connector mounting flange recessed rearward of the dummy opening; and omitting any duct connection for connecting with an airflow duct.

A linear supply outlet system and related devices and methods for efficiently passing air into an indoor space while integrating heating and cooling fenestrations with architectural appearances, comprising: an active register comprising: an active fenestration projection comprising a width thereof no smaller than ⅜″ and no larger than ⅞″, culminating in an airflow opening at a forward extremity of the active register; an active register mounting flange recessed rearward of the airflow opening; and at least one duct connection fabricated to connect with an SDHV duct; and a passive register-connector comprising: a passive fenestration projection comprising a width thereof which is equal to the width of the active fenestration projection, culminating in a dummy opening at a forward extremity of the passive register-connector; a passive register-connector mounting flange recessed rearward of the dummy opening; and omitting any duct connection for connecting with an airflow duct.

A heating, ventilation, and/or air conditioning (HVAC) unit includes a terminal unit. The terminal unit includes a housing having a first panel bordering a return airflow path, a second panel bordering an additional airflow path, and a separating wall disposed between and bordering the return airflow path and the additional airflow path. The terminal unit also includes a sound attenuator formed by the first panel and the separating wall.

A heating, ventilation, and/or air conditioning (HVAC) unit includes a terminal unit. The terminal unit includes a housing having a first panel bordering a return airflow path, a second panel bordering an additional airflow path, and a separating wall disposed between and bordering the return airflow path and the additional airflow path. The terminal unit also includes a sound attenuator formed by the first panel and the separating wall.

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.