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If its what I think your talking about its for air to flow thru and also for pressure. When you shut your door it builds pressure and the pressure goes thru the vents so that you don't pop your ears.
If its what I think your talking about its for air to flow thru and also for pressure. When you shut your door it builds pressure and the pressure goes thru the vents so that you don't pop your ears.
That makes sense. Why the 4 bolts? What do they hold?