My early mentor had a saying that resonated with me — “Avoid Wishful Thinking.” I’ve found that advice has served me well over the course of my 30-year (and still going) career. Living by that credo ...

For the past 50 years, engineers have been “designing” duct systems. Quite often, they were not actually designing the systems, but were sizing duct the duct according to some rule of thumb. The rules ...