The present invention provides a flow grid arranged at a fluid intake side of a fluid flow generating device, the flow grid comprising: a frame configured to be mounted to a housing of the fluid flow generating device; and a fluid flow area connected to the frame, the fluid flow area having an outer perimeter, the outer perimeter having a diameter (d.sub.outer), the outer perimeter being adjacent to the frame, wherein the fluid flow area comprises a polygonal cell arrangement having a kaleidoscopic pattern, wherein the polygonal cell arrangement comprises at least two types of cell geometries sharing a concentric axis, each type of cell geometry being arranged concentrically to the other(s), and wherein the polygonal cell arrangement is convex when viewed from the fluid intake side. There is also provided an ambient air purification device and use of the disclosed flow grid in the ambient air purification device.

A blower includes a fluid introducing box, a fan, a casing, a tubular portion disposed inside the fan to introduce a first fluid and a second fluid separately into the fan, and an upper end portion defining an inlet into the tubular portion. The casing has a suction port forming portion defining a suction port. The upper end portion is disposed between the suction port forming portion and the fluid introducing box. A gap passage is defined between the upper end portion and the suction port forming portion. At least one of the first fluid or the second fluid is introduced into the gap passage from a passage inlet and fluids through the gap passage toward a downstream portion. A distance between the upper end portion and the suction port forming portion in the axial direction at the downstream portion is less than that at the passage inlet.

A blower vacuum, the blower vacuum including a nozzle forming a first opening, a fan housing in fluid communication with the nozzle, an inlet exhaust housing rotatably coupled to the fan housing, and a debris housing. The fan housing forms a second opening. A fan assembly is positioned at the fan housing. The inlet exhaust housing includes an inlet portion and an exhaust portion. The inlet exhaust housing is rotatable to a first position forming a blower operation and a second position forming a vacuum operation. The debris housing is coupled to the exhaust portion of the inlet exhaust housing.

A blower includes: a fan; a lower body having an inner space to receive the fan, and a suction hole; a first upper body communicating with the inner space and having a surface with a first discharge hole; a first damper movably coupled to the first upper body and penetrating the surface; the first damper having a first end facing an outside of the first upper body and a second end opposite to the first end; and a first bar extending along and coupled to the second end of the first damper.

An air channel arrangement of a tower fan, arranged for accommodating an air blower therein, includes a housing having an air inlet, an air outlet and an air blower installation space therein, a volute shell and a volute member having a curved surface portion, wherein the volute shell and the curved surface portion of the volute member are arranged on two sides of the air outlet respectively such that, when the air blower is driven to rotate, the airflow is guided to flow through the air channel smoothly, so that the tower fan has excellent air supply efficiency and is able to prevent eddy airflow being formed in in the air channel and reduce working noise of the tower fan.

A rotating plate misting fan (RPMF) is capable of delivering cooling to industrial environments including loading bays for docked trailers. The RPMF includes a rotating plate assembly configured to eliminate or minimize water collection in the environment area.

The present disclosure describes modular fan unit systems and assemblies. A modular fan unit system assembly may include a mounting structure; and a modular fan unit system. The system may include a plurality of modular fan units, each modular fan unit having an outer housing surrounding an internal fan, the modular fan units being configured to be individually separated from the system; a filter housing unit having a plurality of filter compartments, each filter compartment configured to hold an individual air filter, wherein each modular fan unit is mounted and secured to a back side of the filter housing unit such that each modular fan unit aligns with a respective filter compartment; a plurality of louvre units, each louvre unit removably mounted to a front side of the filter housing unit such that each louvre unit aligns with a respective filter compartment; and a controller communicatively coupled with each of the modular fan units, wherein the modular fan unit system is mounted to the mounting structure.

A fairing and a fan device are provided according to the present disclosure. The fairing includes a fairing body which is arranged at a fan air vent, the fairing body has a fairing area, which is annular and is located at a periphery of a geometric center of the fairing body, and the fairing area is provided with a fairing through hole. In the fairing according to the present disclosure, the fairing body has the fairing area, the fairing area is provided with the fairing through hole, and the fairing body is configured to arranged at the fan air vent, so that the airflow is faired through the fairing through hole, the fairing area is annular and is located at the periphery of the geometric center of the fairing body, so that the fairing body has no fairing through hole at its geometric center.

A casing, which receives a fan, has a suction port forming portion that forms a suction port. A separation tube has a tube upper end portion, which forms an air inlet, through which the air flows into an inside of the separation tube. The tube upper end portion is located on one side of the suction port forming portion in an axial direction such that the tube upper end portion overlaps with a portion of the suction port in the axial direction. A rib is formed at a periphery of the suction port. The periphery of the suction port has: an overlapping region, which overlaps with the tube upper end portion in the axial direction; and a non-overlapping region, which does not overlap with the tube upper end portion in the axial direction. The rib occupies more area in the non-overlapping region than in the overlapping region.

A centrifugal fan is disclosed and includes a lower case, an impeller and an upper case. The lower case includes a bottom plate and a sidewall. The impeller is disposed on the bottom plate. The upper case is assembled with the sidewall to form an outlet. The upper case is formed by stamping and includes a first plane, an inlet and a grille. When the impeller is rotated, an airflow flowing from the inlet to the outlet is formed. The grille is protruded outwardly from the first plane, and includes a connecting frame and plural ribs. A spacing height is formed between the connecting frame and the inlet. Each rib has a first end connected to the connecting frame and a second end connected to the first plane. A pair of notches are disposed adjacent to two opposite lateral edges of the second end of the corresponding rib, respectively.