9.1.3.D.8.b ... "Openings are permitted for the purposes of ducting air to the brakes, cooler & radiator."

This rule seems singular in what it permits ... "openings" only. And this rule is enclosed w/in a section that applies to front spoilers / air dams only. And while there is a rule dealing w/brake ducting (& driver cooling), I did not see any rule that specifically allows IT competitors to install additional ducting for the radiator &/or oil cooler w/in the confines of the bodywork?

And there is nothing that addresses ducting w/in 9.1.3.D.3.a/b.

What am I not seeing here?