In 1948, research by R.G. Huebscher established flow resistance for different shapes of ductwork at equal velocities, which allowed the creation of the duct-sizing calculator or “Ductulator” for ...

Air duct leakage should be a concern to both the designer and the building owner because of its potential impact on initial construction costs, energy usage, and system performance. Every duct system ...

It's been proven that a cold-air intake system adds power, but, if you're building a system for scratch, how large does it need to be? Years ago, I talked with old-time Mopar Super Stock racer John ...