An assembly includes a first bracket and a second bracket. The first bracket includes a first member that includes a plurality of fingers and a first channel between the plurality of fingers. The first channel includes a plurality of teeth. A first flange extends from the first member and includes a first engagement surface. The second bracket includes a second member and a third member spaced from the second member. A second channel is formed between the second member and the third member. A second flange extends from the second member on an opposite side of the second member from the third member. The second flange includes a second engagement surface. In an installed configuration, the first bracket is secured to the second bracket; the first engagement surface faces the second engagement surface; and the plurality of fingers are inserted into the second channel.

A fan frame structure includes a base portion and a wall portion. The base portion has at least one extension section vertically extended from an outer peripheral edge of the base portion, and the extension section has connecting sides. The wall portion is formed along the outer peripheral edge of the base portion through an insert molding process. The wall portion includes a plurality of wall segments connected to the connecting sides of the extension sections, and a clearance is formed between any two adjacent wall segments. With these arrangements, the base portion can better resist a wrapping force from the insert-molded wall portion to avoid deformation.

A centrifugal fan frame structure includes a base plate and a plurality of side wall sections. The side wall sections are discontinuously formed along an outer periphery of the base plate through injection molding, such that a clearance is formed between any two adjacent side wall sections, and portions of the outer periphery of the base plate located corresponding to the clearances are not covered by any injection molded side wall section. And, the side wall sections and the base plate together define a receiving space between them. With the injection molded side wall sections being spaced along the outer periphery of the base plate, a wrapping force from the injection molded side wall sections is effectively reduced to prevent the base plate from structural deformation under the wrapping force.

An upstream space forming portion of a centrifugal blower has a space division portion that divides an upstream space into an inner connection space and an outer connection space. The outer connection space has an overlapping space that overlaps the space division portion in an axial direction, and a non-overlapping space excluding the overlapping space from the outer connection space. A suction port has an outer overlapping portion located outside the separation cylinder in a radial direction, and an outer non-overlapping portion excluding the outer overlapping portion from the separation cylinder located outside in the radial direction. A relationship S1/S2≥0.5 is satisfied when a first area S1 is defined by projecting a boundary between the overlapping space and the non-overlapping space in the radial direction, and a second area S2 is defined by projecting the outer overlapping portion in the axial direction.

The invention relates to a fastening apparatus (1) for fastening a ventilator (2) to a carrier structure, having—at least two support elements (3a, 3b), each being connectable at the first end (4) thereof to the carrier structure, wherein at least two of the support elements (3a, 3b) have a fastening means (5) for fastening a ventilator (2), wherein—the support elements (3a, 3b) are connected at the second end (7) thereof to the adjacent support element (3a, 3b), such that the support elements (3a, 3b) mutually support each other, wherein—the fastening means (5) is spaced apart from a connection point (17), at which the second end (7) is connected to the adjacent support element (3a, 3b).

A blower fan assembly comprising a scroll housing, a forward curved blower wheel, and a blower motor adapted to rotate the blower wheel about a blower wheel axis. The forward-curved blower wheel comprises a plurality of fan blades circumferentially spaced about the blower wheel axis. Each of the fan blades has a leading edge with a leading edge angle and a trailing edge with a trailing edge angle. The leading edge angle is at least 50° and not more than 80°. The trailing edge angle is at least 5.5° and not more than 18.5°. The outer radius is not more than 4 inches (101.6 mm).

A scroll casing has a scroll portion, a discharge portion provided with a discharge port, and a tongue portion. An extended plate has, in a cross section obtained by cutting in a thickness direction, a change point, at which an enlargement ratio of an area of the cross section is enlarged so as to be larger on a downstream side than that on an upstream side due to a change of inclination. In the extended plate, an angle θ1, and an angle θ2 satisfy a relationship of either 0≤θ2<θ1 or 0<θ2≤θ1. A distance L1 and a distance L2 satisfy a relationship of L2<L1.

A modular fan cover assembly for inclusion on an electric motor is selectively configurable for degrees of reduced noise operation. The modular fan cover assembly includes a plurality of cooperating components arranged to direct fluid communication through the assembly. The components may include, for example, a fan cover defining a fan chamber for enclosing the fan, an inlet cover including an inlet chamber and a plurality of inlet apertures, and a silencing insert selectively includable with the fan cover assembly that may include one or more silencing features. The selective combination of the components can redirect airflow through various turns or bend in the modular fan cover assembly to trap or suppress noise propagating from the electric motor. The modular fan cover assembly may be operatively equipped with a blower assembly.

A multi-stage fluid conditioning system having a housing with a fluid inlet and outlet. A shaft extends within the housing and supports a first fan unit with a first magnet/electromagnet plate on an inlet side of said housing and a second fan unit with a second magnet/electromagnet supporting plate on an outlet side of the housing. Each of the first and second magnet/electromagnet supporting plates include at least one vane configured to direct fluid flow. The shaft rotates the plates in order to draw a fluid flow through the inlet and successively across the inlet and outlet sides for thermal conditioning resulting from creation of high frequency oscillating magnetic fields according to a succeeding conditioning operations before being outputted the conditioned fluid from the housing through the fluid outlet.

A blower unit can include an outer housing, an inlet subassembly, a fan subassembly, an outlet subassembly, and a grommet. The outer housing can have an aperture extend along a first axis between first and second ends. The inlet subassembly can be received in the first end of the aperture. The fan subassembly can be received in the aperture adjacent to the inlet subassembly and include at least one wire. The outlet subassembly can be received in the second end. The grommet can be positioned between at least part of the second end and the outlet subassembly. The at least one wire can extend through the grommet. The grommet can seal against the at least one wire. The grommet can seal between the outer housing and the outlet subassembly.