Blower unit, drying device, liquid application system, and printing system

The invention provides an air blowing unit, a drying device, a liquid applying system and a printing system capable of uniformly blowing air from a plurality of injection ports. The air blowing unit (300) has a hollow structure and blows air from a plurality of injection ports (304) disposed on a first surface (302), and the air blowing unit (300) has a structure in which a gas inflow port (308) into which gas supplied from a gas supply source (320) flows is formed on a second surface (306) that intersects the first surface and is not provided with the injection ports. The total ratio of the opening area of the plurality of injection ports to the opening area of the gas inflow port is 0.1-1.0. 本发明提供一种可以实现从多个喷射口均匀地送风的送风单元、干燥装置、液体赋予系统及印刷系统。送风单元(300)具有中空结构，并从配置在第一面(302)上的多个喷射口(304)进行送风，所述送风单元(300)具有如下结构：使从气体供给源(320)供给的气体流入的气体流入口(308)形成于与第一面交叉的第二面且未配置喷射口的第二面(306)上，多个喷射口的开口面积相对于气体流入口的开口面积的合计比例为0.1以上且1.0以下。