Here's What Those Secret Rubber Flaps Behind Your Rear Bumper Are For
One of the reasons that these exhausters exist is to relieve pressure
that builds when someone closes a door, as high pressure can cause
discomfort to occupants, increase door closing efforts, and even put
undue strain on windows and closures, possibly causing them to unseat
from their seals and make noises as air leaks out.
On top of that, to increase passenger comfort and more optimal window defrosting,
exhausters facilitate continuous, fresh circulation from the air intake
of a vehicle (usually from vents at the cowl—the base of the
windshield) through to the very rear of the car, and out of the flaps.
This way, occupants get steady ventilation without having to deal with
the noise and potential debris associated with opening a window.
The
one-way valves also makes life easier for the HVAC blower motor, which
has to push against the cabin’s pressure to feed air through the ducts
and out of the vents in the dash.
(Jalopnik.com)
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