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David Richardson

David Richardson serves the HVAC industry as Vice President of Training for National Comfort Institute, Inc. (NCI). NCI specializes in training focused on improving, measuring, and verifying HVAC and Building Performance. If you’re an HVAC contractor or technician interested in learning more about building science applied to HVAC, contact David at ncilink.com/ContactMe.

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Add Fan Airflow to Static Pressure Readings in Four Simple Steps

David Richardson

November 26, 2018

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The good news is that once you measure static pressure, you can estimate fan airflow in less than 30 seconds with the right information. Once technicians understand that static pressure testing gets them to fan airflow, they will see why it is important to measure it on every call.

Measuring Static Pressure Readings - The ACHR News

Using Static Pressure to Pinpoint Air Upgrade Opportunities

David Richardson

October 22, 2018

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You might wonder, “Why can’t I just use a duct calculator and tape measure to identify duct repairs?” You could, but that means making a lot of assumptions and wasting valuable time.

Airflow through a system graph - The ACHR News

Four Airflow Values You’ll Use Daily

David Richardson

September 24, 2018

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Airflow is a general term that’s easy to misinterpret. When I first learned about airflow, I had to classify it into four values that made sense to me. The easiest options are the measurement location or source of the airflow reading.

Five Issues That Cause Static Pressure Readings to Look Great

Several situations can cause readings to look better than they really are

David Richardson

August 20, 2018

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Many of the calls I receive about goofy static pressure readings typically tie into one of five issues. Let’s look at these issues and how you can be sure they don’t affect your measurements.

Four Reasons for Contractors to Ignore Static Pressure Readings

Some techs believe measuring is a waste of time

David Richardson

July 30, 2018

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The first reason not to measure static pressure is because hooking up a refrigeration manifold to the system tells you everything you need to know. Don’t worry about the fact that this practice often leads to leaks, can introduce non-condensables, and can cause potential refrigerant contamination.

Follow These Three Vital Steps to Properly Resize a Duct System

David Richardson

July 2, 2018

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In order to understand the foundational principles of duct sizing, a thorough study of ACCA Manual D is a great place to start.

Estimate Room Airflow in Six Steps - ACHR

Duct Dynasty: Estimate Room Airflow in Six Steps

Get your customers engaged by including them in the process

David Richardson

May 28, 2018

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Several months ago, I wrote a Duct Dynasty article titled “Four Steps to Optimize a Duct System.” Since then, I’ve received numerous requests to expand on the simple calculations I mentioned that can help you estimate room airflow with a customer’s input.

How to Overcome Four Common Obstacles to Selling Duct Upgrades

David Richardson

April 9, 2018

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It seems our industry is becoming “commoditized,” and we are unintentional accomplices. We’re too comfortable swapping equipment and installing silver bullets while moving away from providing true comfort.

Four Ways You Might Be Using an Air Duct Calculator Incorrectly

For contractors, it’s better to light one candle than to curse the darkness

David Richardson

March 12, 2018

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The air duct calculator, or “ductulator,” is a commonly used tool for designing and installing duct systems. Unfortunately, many designers and technicians receive limited instructions on its correct use.

Tackling Winter Humidity HVAC System Issues

David Richardson

February 19, 2018

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Tackling winter humidity issues can be a nightmare if you don’t have a grasp on the foundational principles that influence them. Have you ever wondered what causes some homes to be too dry even with a properly operating humidifier?

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