NCI Article Library

High-Performance HVAC Resources

Is HVAC System Duct Leakage Testing Enough?

Is HVAC System Duct Leakage Testing Enough? by David Richardson Duct leakage is an issue that has challenged the HVAC industry for as long as duct systems have been installed. The concept of resolving duct leakage issues isn’t a new one. If you have seen some of the...

How to Plot Fan Airflow

How to Plot Fan Airflow by Rob Falke To be well prepared for this new level of diagnostics, begin collecting copies of the fan data found in most installation instructions for the equipment your company installs and services. The most important diagnostic truth about...

How to Interpret Fan Performance Data

One test essential to successful CoolMaxx™ service reporting is interpreting fan airflow from the manufacturer's fan data after you measure total external static pressure. As with most HVAC system diagnostic testing, it takes more than textbook learning to become an...

How to Implement CoolMaxx for Maxximum Success

Since the heat has settled over most of the country we have had an increasing number of calls reporting a wide range of methods of implementing the CoolMaxx report. While many of the variations are interesting, after a discussion of how we intended CoolMaxx to be...

How Much Cooling Can Your Fan Afford?

The quest for higher efficiency cooling equipment is hitting a barrier. Unsuspecting installing contractors are being handed hidden liability that is difficult to identify and resolve. Certain cooling coils are being built for the highest possible SEER rating, but...

Getting a Diagnostic Test From a Service Call

Besides the valuable information the reading provides to help resolve the service call issue, it can be a prime lead-in to selling a complete system diagnostic and potential duct renovation work. To provide your customers with air conditioning systems that perform as...

Introducing the Testo 435

For over a decade NCI has promoted the TSI VelociCalc 8386 as the best air balancing multimeter on the market, and it's still a great test instrument. It has served us well and was the instrument of choice, but is no longer manufactured. We are committed to bringing...

Include the Ducts in Your Service Agreements

Adding the ducts to your service agreements is one of the best steps you can take to move your company forward in implementing air diagnostics. It's a small thing that can bring great and immediate results. Spring is the perfect time to implement this new service....

How to Use Static Pressure Budgets

How to Use Static Pressure Budgets by Rob "Doc" Falke, NCI President Static pressure budgets were originally developed to help new air diagnostic technicians interpret static pressure readings. These budgets provide a set of rules to compare pressure readings so they...

How to Use Fan Performance Data in Your Diagnostics

Almost every day we receive requests for additional generic fan performance tables other than .50" table we published previously. Well, you asked for it, you got it. We've just introduced two new generic tables, one for constant speed blowers with up to .80" ESP and...