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Maybe not windshield defrost capability, but airflow to the side window will be affected.
Installed in an "air vent" as OP was questioning will block airflow out of that vent. Obviously, this would affect the driver the most . . .
Norm
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'08 GT coupe 5M (the occasional track toy)
'19 WRX 6M (the family sedan . . . seriously)
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