Hi Velocity Systems

Fundamentals of a High-Velocity Air Duct System

If you attended the Virtual Fall Technical Conference, you heard all about the fundamentals of high-velocity air duct systems from David Monson. If you missed it, you're in luck! We’re here to recap the session and provide valuable educational tools for any business performing HVAC system cleaning for these highly complex systems.

After reading this article, you will

  • Know how high-pressure systems relate to high-velocity systems.
  • Know the components of high-velocity system designs.
  • Know how to clean and troubleshoot cleaning high-velocity systems.

Consumers choose high-velocity systems for a wide range of reasons. One key reason these systems may be favored is for their smaller footprint — construction costs are now calculated per cubic foot instead of per square foot, making installing high-velocity systems more affordable than in the past. Their smaller size also makes them ideal for discretely adding air conditioning to historic buildings.

What is a high-velocity system?

What is a high-velocity system? First, let’s talk about high-pressure vs. high-velocity systems. Professionals familiar with high-pressure systems may think that they are already aware of high-velocity systems. However, there are marked differences between these two systems.

For instance, which holds more air? Eleven 55-gallon drums or a single scuba tank? The answer: they hold just about the same. The difference between the two is pressure.

It takes a certain volume of air with particular heat content to do the heating and cooling functions in a building. If space is at a minimum in the building, how do you deliver the required volume of air? The answer is to pressurize it and deliver it through smaller ducts.

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