Every passenger car , SUV , pick-up , bus , commercial truck etc.. has an air ventilation system which drivers and passengers use , almost without thinking about it. The air vent is at the end of the air conditioning system and is really the only part which the driver/ passenger ever touch. The problem arises when the air vent stops working , has broken parts and the air flow can't be adjusted inside the vehicle. This 4 section video takes you deep inside the air vent and shows you how it works and how to replace a critical component , the vent tab.
Click this link to see the video : https://youtu.be/b1l_T2T-JXM