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Door ventilator

Ted

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Ted Newbie

Ted

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Hi All,

In my car rear door, there is grilled area for ventilation purpose ( see picture 1). Originally it shall be fixed with a valve like window panel.(See picture 2). Currently I am not having that thing in both rear doors. What is the purpose of this particular thing? 

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Davy Contributor

Davy

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The interior of the car is essentially sealed. This is a pressure relief valve helps maintain proper pressure, temperature and to minimise fogging up on the windows. It also helps bleed out excess pressure when closing doors of the car, because a sudden spike in pressure occurs when doors are closed.

In most cars, the pressure relief valve is located behind the rear bumper, towards the side. 

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