Rob Falke

National Comfort Institute

Rob “Doc” Falke serves the industry as president of National Comfort Institute an HVAC-based training company and membership organization. If you're an HVAC contractor or technician  interested in a building pressure measurement procedure, contact Doc at  or call him at 800-633-7058. Go to NCI’s website at for free information, articles and downloads.

Use the Air Changes Calculation to Determine Room CFM
Engineering room airflow may present a real challenge when balancing an HVAC system. Most calculations only use the heat loss or gain of a room to decide on required airflow and often don’t take into consideration required room ventilation needs.
Why Add Duct Renovation to Equipment Replacement?
Duct renovation refers to the process of testing, diagnosing, repairing, and balancing duct systems. Typically this service is offered to a customer at the time a contractor proposes an equipment replacement, although more contractors are including this offering with a service call when the need is apparent.
Rooftop Curb Diagnostics and Solutions
A recent evaluation of several hundred commercial rooftop systems around the country exposed a hidden flaw that deteriorates system efficiency up to 40% Rooftop equipment curbs. Let’s take a look at how you can quickly diagnose and solve curb problems you may encounter in the field.
How to Charge What You’re Worth
Cost + overhead + a fair profit is the basic formula used by the HVAC industry to determine the price of a typical repair or equipment replacement. The net result of this practice is an average company net profit of 2% to 3% year-after-year. Let’s take a look at what some companies have learned to do to earn profits on some of their work that is ten times the industry average.
A Service Legend Remembered
With the passing of my father, Walt Falke this week, it seems there is nothing more important or appropriate to write about than the legacy Dad left behind to this industry.
Simplified Pressure, Temperature, and Airflow Diagnostics
Diagnosing the performance of an HVAC system is simple if you master the art of profiling. Profiling consists of taking a series of measurements across a system and subtracting to quickly find the cause of the system defect. Let’s take a look at how you can add profiling to your daily diagnostic routine.
An Industry of Opportunity
Let’s take a look at what opportunities each of us may have in the HVAC industry and how we can produce the best possible results in our own careers.
Air Balancing a System with Zoning
Balancing a heating and cooling system that includes zoning requires several additional steps compared to a standard HVAC system. Without these extra steps, your customers may experience excessive noise and very low operating efficiencies.
Correcting For Invisible Air Traps Near Fans
Have you ever installed a system that suffered from low airflow and no matter what you did to try to fix it, the solution eluded you?
How to Calculate Water System BTU Measurements
In some regions, homes and buildings are heated with water. This article will be a brief introduction to water system BTU measurement.
Defining a 'Quality' HVAC Installation
Sufficient data is now being gathered documenting that the typical code-compliant system only delivers about 63% of the equipment-rated heating or cooling capacity into the building it serves.
HVAC Game Changer: Calculating System BTUs
The amount of BTUs a system delivers into a building can be effectively calculated when system temperatures and airflows have been measured. Here's a look at the basic steps of HVAC System BTU Measurement.
4 Ways to Measure Airflow
While industry standards specifying ventilation rates are coming out of the woodwork, a practical standard describing how to measure ventilation airflows that can be applied in the field is hard to find.  Let’s take a look how you can determine residential and commercial exhaust fan airflow in the field.

Fans at Either End of the Duct

So, Not Air Balancing Yet?
Air balancing in the HVAC profession has come of age, and is now included in nearly every emerging standard requiring quality assurance.
How to Use an Air Balance Hood
Air balancing used to be a term reserved for the testing and adjusting of commercial HVAC systems. Today, in the residential and light commercial HVAC industry, the term air balancing is more accurately applied to HVAC System Diagnostics, Field Measured-Performance Verification, or Installed Efficiency Documentation.

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