Comparison Xiaomi Lexiu Large Vertical Fan vs Xiaomi Mi Smart Fan

The presence of an autonomous way to power the device. Applicable for portable mini-fans, since stationary ones are powered by 230 V mains. There are two ways to feed:

- USB port. Models designed to be installed near the PC workplace. And it's not a problem to find a USB port, both in a PC, a laptop or a power bank.

- Battery. Portable models that do not need a power supply and can be used even outdoors. The built-in battery allows them to work for a long time. Naturally, the power of such fans is small and, like any battery technology, they need to be recharged and can be discharged at the most unsuitable moment.

The maximum power consumed by the fan during operation. The higher the power consumption, the higher, usually, the greater the airflow rate created by the fan, and, accordingly, the higher the performance of the device. On the other hand, power usually directly affects the price, all other things being equal.

The number of preset speeds at which the fan blades can rotate. The rotation speed is usually set by pressing the corresponding button (in addition, there is also a stepless adjustment, see the relevant paragraph). Most modern models with step adjustment have three preset speeds.

The maximum performance provided by the fan — that is, the maximum amount of air that it can pass through itself in an hour.

The air flow is selected by manufacturers, taking into account the area and, accordingly, the volume of the room for which the device is designed. For efficient operation, the device must be able to pass the entire volume of processed air through itself at least once per hour. At the same time, for models with the same area of the room, different performance parameters can be claimed — accordingly, the processing speed and efficiency will differ.

Also, note that the recommended area of the room can be estimated by performance if the latter is not stated in the characteristics. For example, if the device provides 200 m³/h, this means that the volume of the room can be less than 200 m³, which, with a standard ceiling height of 2.5 m, gives an area of 200/2.5 = 80 m². And ideally, the area should be even 2-3 times smaller — that is, be about 25-40 m².

Range of effective reaching of the airflow from the fan blades (in metres). The higher it is, the more powerful the device in front of us.

The maximum noise level produced by the fan when running at low speed. It is good to know this value, especially in the conditions of operation of the device at night or in rooms that need silence.

The maximum noise level produced by the fan when operating at the highest speed. For comparison: a noise of 30 dB corresponds to a distinguishable whisper at a distance of 5 m, 40 dB — to human speech, and 50 dB — to the sound background in an office room. The quieter the fan runs, the more comfortable it is to use.

— Stepless adjustment. The ability to adjust the rotation speed when a slider is used instead of several buttons. In this case, you can set the speed not step by step, but over a wide range.

— Oscillation. Thanks to the oscillation, the fan can change the direction of the airflow horizontally, while remaining stationary. The direction can be set manually, and it can also change automatically when the fan constantly changes direction. Fans with small blade diameters usually do not have this capability.

— 3D rotation. Automatic rotation is assumed not only in the horizontal plane but also vertically. The implementation of this function is different: horizontal and vertical movements can be alternated, or the head of the fan can make spherical movements. Fans with 3D rotation are better at mixing air, and when used in conjunction with an air conditioner, better cooling efficiency is achieved.

— Night mode. Designed to reduce noise levels, fans in this mode reduce the speed to a minimum and periodically turn off the rotation of the blades. Note that in this mode you will have to sacrifice the power of the fan, and in hot weather, this mode may not be relevant.

— Wind imitation. This mode periodically changes the speed of rotation of the blades, sometimes turning them off a...ltogether, creating gusts of wind. Different manufacturers call this mode differently: comfort mode, breeze mode, natural, and the like, but they all serve the same purpose.

— Height adjustment. The ability to change the height of the fan manually. Provided, usually, in floor standing models.

— Tilt adjustment. The ability to change the tilt angle of the airflow vertically. In the vast majority of models, it is set manually, but some models can change it automatically. Simple and inexpensive models often lack this capability.

— Timer. A device that automatically turns off the fan after a certain time set by the user. The presence of a timer allows, for example, to turn on the fan at night and go to bed — the device will turn itself off at the right time.

— Remote control. Possibility to control the fan from a distance. Advanced fan models are equipped with remote controls that allow you not only to turn the device on and off but also to adjust the speed and set the timer value.

— Control via smartphone. Fans that support this feature can connect to your home Wi-Fi network and be controlled directly from your phone app. Also, some models can be integrated into smart home systems to perform certain scenarios. There are models in which this function completely replaces the remote control.

— Humidification. Fans with this function are a hybrid of a classic fan and a humidifier. They have a reservoir with water and a device that supplies water vapour to the fan blades, where it is carried around the room by airflow. In general, such a combination is more effective than classic humidifiers, as it provides the evenest distribution of moisture. However, fans with humidification are quite rare.

— Ionization. The presence of a built-in air ionizer. It is believed that air saturated with negatively charged oxygen ions is extremely beneficial for health. Not all fan models (even expensive ones) are equipped with an ionizer. However, it can also be purchased separately.

— Backlight. The presence of built-in lighting sources in the fan (usually LED lamps or LED strip). The backlight can be used as an additional light source or night light, and can also be used in a decorative role to improve the appearance of the fan, making it an attractive element of the interior.

— Clip mount. Such a device allows fixing the fan on the edge of the wall shelf opposite the face, which will not only create a more pleasant air flow but save space on the desktop surface (and even on the shelf where the fan is installed). In addition, such a mount is more reliable than a simple installation on a horizontal surface — overtiping a fan with a clip mount is much more difficult than a fan standing on a desktop or a shelf.

— Display. A small screen designed to display various service information. The display can show data on the operating mode, the set timer, the time until the fan is turned off, etc. The display makes fan control more convenient, but other things being equal, such devices are usually more expensive.

The ability to automatically rotate the fan both vertically and horizontally. These movements can be alternate or spherical. The 3D-rotation system ensures uniform air circulation around the perimeter of the serviced premises.