Fan

… Although there is little difference between the working principle, structure, and function of a blower and a compressor, they are distinguished by the degree of pressure rise inside the machine, and a blower is further divided into a fan and a blower depending on the pressure rise. In other words, when standard air at 101.3 kPa (1 atmosphere) and 20°C is sucked in, a fan with a gauge pressure rise of 9.807 kPa (10 kPa) or less is called a fan, a blower with a pressure rise of 9.807 to 98.07 kPa (10 to 100 kPa), and a compressor with a pressure rise of 98.07 kPa (0.1 MPa) or more (these are the traditional classifications of the Japan Society of Mechanical Engineers converted into SI units, but usually the decimals are rounded up and the classification in parentheses is used). The capacity of a blower is expressed by the degree of pressure rise and the amount of gas (flow rate) it handles. …

*Some of the terminology that mentions "fan" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　送風機と圧縮機は作動原理，構造および作用などに大差はないが，両者は機械内での圧力上昇の程度で区別され，送風機はさらに上昇圧力の高低によりファンとブロワーに分けられる。すなわち，一般に101.3kPa(1気圧)，20℃の標準空気を吸い込んだ場合，上昇圧力がゲージ圧力で9.807kPa(10kPa)以下のものをファンfan,9.807～98.07kPa(10～100kPa)をブロワーblower,98.07kPa(0.1MPa)以上を圧縮機と呼んでいる(従来の日本機械学会での区分をSI単位に換算したものだが，通常端数を切り上げ，かっこ内の区分を用いる)。　送風機の能力は，圧力上昇の程度と取り扱う気体の量(流量)で表される。…

※「fan」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報