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Originally Posted by Old Tele man
Unfortunately, that "grille" becomes OPAQUE to airflow at higher speeds, slowly approaching a solid blockage eventually. It's sorta like *how* the holes in microwave oven door/window screens stop the microwaves from coming out and cooking YOU.
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An example of 'vena contracta'. I'm thinking at right angles to the flow at the rear of the roof it would be a non-issue. Maybe a piece of perf metal painted body color for my grille block?