Reply to #20 Hi O.G. Am conscious not everyone is a fan/convinced by NACA ducts (which ever way round fitted). Lots of knowledgeable opinions on a relating thread, ref /forum/techtalk/naca-duct-installation-advise I'd suggest this video confirms the principle of NACA ducts work in reverse;
Admittedly this thread has near enough turned into a continuation of the other thread. Albeit, I do still intend on fitting two - one each side, and each with a different purpose. As always, all opinions and input appreciated. Chris