XF-4 fresh air system for bus A/C 1.Control the ventilation door 2.ABS, aluminium-plastic 3.Small ... order accept Fresh air system for bus A/C specificaiton:Material: ABS, aluminium-plastic fan, 3M filter, replaced nut ... , seal and reliable, turn smoothly and easy assemble. Accessories:1. Assemble hole: plentiful selects, or customization;2. Connector: customization.Technical ...