A counter-rotating fan, comprising an impeller assembly and an air guide structure. The impeller assembly comprises a first stage impeller and a second stage impeller, of which the rotation directions are opposite. The pressure surfaces of first blades of the first stage impeller are configured to be opposite the suction surfaces of second blades of the second stage impeller, and from the blade root to the blade tip, each of the first blades and the second blades bends toward its own rotation direction. The air guide structure comprises a flow guide cover. The flow guide cover is provided at the center position of the air intake side of the first stage impeller, and the air intake side surface of the flow guide cover at least partially forms a flow guide surface, the flow guide surface extending along the axis of the first stage impeller in the direction away from the counter-rotating fan.

A mobile climate control assembly that includes a portable housing with a first fan blower-wheel assembly and a second fan blower assembly each respectively having a wheel blade member, partially surrounded by an air deflector wall, disposed within a housing cavity and operably configured to rotate 360° around an axis of rotation parallel and non-co-planar with respect to one another. The assembly also includes a fan motor operably coupled to the wheel blade members and an electronic controller electronically and communicatively coupled to the fan motor and operably configured to independently and selectively control rotation of the wheel member of each of the first and second fan blower-wheel assemblies to generate an ambient air velocity gradient along at least an approximate 90° angular traverse path from the front face and without rotation of the portable housing.

A system of fans ventilates heated air from within an IHS (Information Handling System), such as a rack-mounted server, when operated during normal conditions at a rated fan speed. A controller detects a failure of a fan of this fan system and identifies the functioning fans of the system. One or more of the functioning fans are selected for boosting by operation of a fan failure compensation circuit that has been configured for delivery of additional power to the selected boost fans. The fan failure compensation circuit delivers an output voltage that boost the airflow output of the system to compensate for the failed fan. By increasing the output voltage by approximately twenty percent, the boosted fans operate at approximately fifteen percent above rated speeds, which has been demonstrated to compensate for a failed fan while avoiding further failures during the expected lifespan of the fan system.

A fan includes a support, a motor mounted at the support and including a first rotation shaft, a first blade mounted at one end of the first rotation shaft, a transmission mechanism mounted at the support and connected to another end of the first rotation shaft, and a second blade. The transmission mechanism includes a second rotation shaft. A rotation direction of the second rotation shaft is opposite to a rotation direction of the first rotation shaft. The second blade is mounted at the second rotation shaft. A tilt direction of the first blade is opposite to a tilt direction of the second blade.

A ceiling fan module with an energy dissipation function and a configuration method thereof are disclosed. The ceiling fan module includes a fan rack, a fan and an energy dissipation assembly. The energy dissipation assembly passes through the fan rack and the fan and connects the fan rack and the fan; the energy dissipation assembly includes steel cables (3), high-damping vibration attenuation rings, fasteners and balancing weights; two high-damping vibration attenuation rings are sleeved on one steel cable, and the two high-damping vibration attenuation rings are respectively located at two ends of the steel cable; the high-damping vibration attenuation rings are mounted on the fan rack and the fan and separate the fan rack from the fan; the fasteners are mounted on the steel cables and are located on outer sides of the high-damping vibration attenuation rings and the fan rack .

The present disclosure relates to a portable air purifier. The portable air purifier includes: a fan case having a narrow width portion at the front thereof and a wide width portion at the rear thereof, the narrow width portion including a space the radiuswise width of which is less than the radiuswise width of the wide width portion, and a fan blade protruding centrifugally further than the space formed inside the narrow width portion while being disposed at the wide width portion.

Method and apparatus for ventilating an interior space, such as a large industrial structure with at least one bay opening. A ventilation system includes an array of M by N fans stacked into a two dimensional (2D) array. A rigid frame supports the array. A seal assembly provides a nominally fluid-tight seal between an outer perimeter of the array and the bay opening. A locking assembly mechanically couples the frame to the bay opening. In some cases, a bay door can be partially retracted and attached to a top of the frame. In other cases, the bay door may be fluidically permeable (e.g., a chain, a screen, etc.) and the array is secured behind a fully closed door. Cooling air is directed out the bay opening at a suitable time, such as overnight. A soft-start motor capability can be used to initiate operation of the array.

A dual window fan having a rectangular body adapted to engage a window, two fan heads pivotably engaging the body independently of each other about a vertical pivot axis from aiming directly outwardly normal to the body to aiming inwardly through a pivot angle of at least 225 angular degrees.

A control device and a method for controlling a system having at least two fans (1) and/or fan groups for generating a defined setpoint value (VG,setpoint, ΔpG,setpoint), wherein, by changing the operating points of at least one fan (1) depending on which setpoint value is fixedly predetermined, at least one of the fans (1) is brought to an optimal operating point and thereby the efficiency ηG of the system is increased.

A mounting assembly for a fan of a heating, ventilation, and/or air conditioning (HVAC) system includes a frame configured to couple to the HVAC system. The frame includes a support rail having a flange. The mounting assembly includes a first guide rail coupled to the frame and having a first lip extending at an oblique angle relative to the flange. The mounting assembly also includes a second guide rail coupled to the frame and having a second lip extending at the oblique angle relative to the flange. The first and second lips are configured to support and guide translation of a chassis of the fan toward the support rail such that the chassis of the fan engages with the flange. The flange is configured to support the fan offset from the first and second lips in an installed configuration of the fan with the mounting assembly.