When helping my uncle in Birmingham renovate his office, I came across this page while researching online. I didn’t expect to get caught up reading about the details of an air vent unit, but it turned out to be really insightful. It explained how these units balance fresh air intake and circulation, which makes a huge difference in enclosed spaces. In the UK, where we spend so much time indoors because of the weather, that’s actually quite important. I felt glad to finally recommend him something useful that wasn’t just another random gadget.