@GizmoOcean @Mw_ottawa @trendless @3M @JimRosenthal4 @CorsIAQ 200mm is the largest common size I think. They're usually speed adjustable, but may require a separate controller to do so (not expensive).
@GizmoOcean@Mw_ottawa@trendless@3M@JimRosenthal4@CorsIAQ 200mm是我认为最大的普通尺寸。它们通常速度可调，但可能需要一个单独的控制器来实现（不昂贵）。