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The issue for this for me is to make something that will modulate.
Sheet metal seems like the best bet as it'll allow for the airflow pressure against it to be deflected. Fibreglass would do as well.
Corflute would likely flex against the air pressure on the outside of it. And be difficult to mount and control with the AC Condenser in the way.
My grill is an open type with 'blades' in the centre, so inserting 'blades' behind it that modulate would be a fantastic idea and could be black and so maintain the stock look.
A lower grill block (solid) would sort the remainder of the grill out.
But I don't yet have the sheet metal / fibreglass to make the 'blades' with, and then I have to find a small enough actuator to fit in front of the AC condenser (which would need to first be removed for access to install them).
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