E 450 V8-5.4L (2009)
Sound Proofing / Insulation: Description and Operation
Insulation
Insulation is used as a sound deadener to reduce exterior road and powertrain noises from the interior of the vehicle. Mastic insulators are also used as
insulation. Insulation is installed:
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under the roof.
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above and below the dash.
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at the cowl sides.
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over the front and rear floorpan areas.