An air register can control airflow direction and intensity. The air register includes an attachment mechanism that is configured to attach to a surface. The air register further includes a plurality of diffuser discs attached to the attachment mechanism and configured so that they may be manually moved from a closed configuration to an open configuration. The diffuser discs include a plurality of apertures that allow air to flow therethrough. In the closed configuration, the diffuser discs are arranged to cover the apertures so that air cannot flow therethrough. In the open configuration, the plurality of diffuser discs are spaced apart to allow air to flow through the apertures. Further, the diffuser discs can be tilted to control airflow direction.

A vortex ring generation device includes a casing and an extrusion mechanism. The casing has a gas passage and a discharge port. The extrusion mechanism extrudes gas in the gas passage such that the gas in a vortex ring shape is discharged from the discharge port. V (m.sup.3) represents an extrusion volume, D (m) represents a diameter of the discharge port, L (m) represents a length of a cylinder having the diameter D and the volume V, and U (m/s) represents a discharge flow rate 0.045≤D≤0.135, 0.15≤L≤0.35, and 3≤U≤5.

A portable air purifier may include a housing provided with an inlet through which air is suctioned, a filter, and a fan module and forming an air flow path in a vertical direction, a discharge disposed at an outlet of the housing and configured to guide a discharge direction of air, a rotational supporter which is connected to the housing, movement of which is restricted, and which supports the discharge in a rotatable manner, and a rotational guide disposed respectively at the discharge and the rotational supporter and configured to guide rotation of the discharge to allow the discharge to rotate within predetermined angles.

There is provided a nozzle for a fan assembly. The nozzle comprises an air inlet, a first air outlet and a second air outlet that are oriented in convergent directions, and a valve for controlling the first and second air outlets. The valve comprises one or more valve members that are moveable to simultaneously adjust the size of the first air outlet and inversely adjust the size of the second air outlet. The nozzle further comprises a third air outlet and a fourth air outlet, the third air outlet being opposite the fourth air outlet, the third and fourth air outlets being oriented in convergent directions, and the third air outlet and the fourth air outlet each being substantially perpendicular to each of the first and second air outlets.

In one instance, a cooling unit for cooling a refrigerated room includes a fan base and a fan guard that both twist and rotate to change pitch thereby allowing the cooling unit air to be directed in many directions as desired. The fan base has a flange portion and a conduit portion. The conduit portion of the fan base mates with an opening in a conduit member of the fan guard. The opening in the fan guard is sized and configured to form an interference fit with at least a portion of a conduit portion of the fan base while allowing rotation of the fan guard relative to the fan base about the longitudinal axis. The second longitudinal end of the fan-guard conduit member is at least partially angled to allow the rotation about a lateral axis in order to pitch the direction of the grill front wall.

A fluid discharge device includes a base portion defining a fluid flow passage and having an opening at a downstream end of the fluid flow passage, and a grill portion disposed to adjust a flow direction of the fluid blown from the opening. The grill portion includes a flow passage forming body defining a main flow passage and an auxiliary flow passage. In the flow passage forming body, the auxiliary flow passage surrounds the main flow passage and the auxiliary flow discharged from the auxiliary flow passage flows outside of the main flow discharged from the main flow passage. The flow passage forming body is configured such that a direction of the auxiliary flow discharged from the auxiliary flow passage corresponds to the direction of the main flow discharged from the main flow passage, when the flow direction of the fluid blown out of the opening is adjusted.

A fluid discharge device includes a base portion defining a fluid flow passage and having an opening at a downstream end of the fluid flow passage, and a grill portion disposed to adjust a flow direction of the fluid blown from the opening. The grill portion includes a flow passage forming body defining a main flow passage and an auxiliary flow passage. In the flow passage forming body, the auxiliary flow passage surrounds the main flow passage and the auxiliary flow discharged from the auxiliary flow passage flows outside of the main flow discharged from the main flow passage. The flow passage forming body is configured such that a direction of the auxiliary flow discharged from the auxiliary flow passage corresponds to the direction of the main flow discharged from the main flow passage, when the flow direction of the fluid blown out of the opening is adjusted.

There is provided a nozzle for a fan assembly. The nozzle comprises an air inlet, a first air outlet and a second air outlet that are oriented in convergent directions, and a valve for controlling the first and second air outlets. The valve comprises one or more valve members that are moveable to simultaneously adjust the size of the first air outlet and inversely adjust the size of the second air outlet. The nozzle further comprises a third air outlet and a fourth air outlet, the third air outlet being opposite the fourth air outlet, the third and fourth air outlets being oriented in convergent directions, and the third air outlet and the fourth air outlet each being substantially perpendicular to each of the first and second air outlets.

A humidifier includes a main housing, a fan unit and an air guiding arrangement, which includes a guiding roller and a partitioning assembly. The partitioning assembly is supported in the main housing at a position adjacent to the guiding roller to substantially enclose the water storage compartment. The partitioning assembly defines at least one air slot and an air passage channel, wherein when the fan unit and the guiding roller are driven to rotate, air is drawn from the air inlet and guided to pass through the air slot to reach the water storage compartment for effectively mixing with the water in the water storage compartment to form a predetermined amount of mist. The mist is arranged to pass through the partitioning assembly through the air passage channel and the fan unit, and eventually discharged out of the main housing.

A humidifier includes a main housing, a fan unit and an air guiding arrangement, which includes a guiding roller and a partitioning assembly. The partitioning assembly is supported in the main housing at a position adjacent to the guiding roller to substantially enclose the water storage compartment. The partitioning assembly defines at least one air slot and an air passage channel, wherein when the fan unit and the guiding roller are driven to rotate, air is drawn from the air inlet and guided to pass through the air slot to reach the water storage compartment for effectively mixing with the water in the water storage compartment to form a predetermined amount of mist. The mist is arranged to pass through the partitioning assembly through the air passage channel and the fan unit, and eventually discharged out of the main housing.