I see.
I still wonder if the filter media discounts the venturi effect, as the filter is between the venturi and the carb inlet. Maybe not.
Some K&N filters have a venturi inside. That may be among the most practical means of having a venturi, yet still having filtered air. A lot of old school Trumpet guys would slap a venturi right onto the carb, with no filter beyond a little screen, (if that) much like these:
I don't imagine it was much of a problem on sunny days. Then again, when I clean my filter...
