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.

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.
Example: A 10- ton packaged unit in a rooftop application placed on a curb.
New Commercial HVAC Static Pressure Test Methods
Static pressure measurement on commercial HVAC systems can vary significantly from one type of equipment to another. To remain savvy here's a look at the latest commercial air pressure testing techniques.
A criss-crossing of ductwork in an HVAC system makes for interesting artwork.
Is Real Efficiency from the HVAC Equipment or from the System?
Ratings for HVAC equipment mean nothing unless the duct systems is performing well. Here is a look at how duct system upgrades are necessary to make equipment perform at promised energy efficiencies.
A vew of homes in San Francisco, CA
HVAC Service: Quick Building Pressure Diagnostics
Most buildings unintentionally operate under some level of positive or negative pressure. These pressures are usually caused by a defective duct system. Could a 5-minute building pressure test be the answer to your residential HVAC customers' comfort problems?
For HVAC Service Technicians: Three-Phase Voltage Measurement Principles
In the last HotMail article, Doc described the steps required to measure single phase voltage. Many HVAC contractors and technicians wrote asking for a similar article detaining how to measure three-phase voltage. So here it is.
Air conditioning service technican checking voltage on a blower motor.
The Principals of Single-phase Voltage Measurement in HVAC Systems
Correctly measuring and interpreting voltage is essential to every HVAC professional in the field. In an effort to help field techncial professionals be more accurate, here is a look at the procedures for measuring single-phase voltage.
Do You Know How To Determine HVAC Exhaust Fan Airflow?
While HVAC 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. Here are some tips.
Testo Temperature Measurement Device
For HVAC Systems, Efficiency Measurements Are The "Delta" Difference
When measuring the performance of an HVAC system, the term 'delta' is often used to express the difference between two measurements.

Dec 2, 2014

2015 Fleet Trends

Join Sean Kilcarr, Senior Editor at Fleet Owner, to hear about advancements in light vehicle manufacturing and technology. Sean will cover the latest manufacturing trends, including aluminum body frames, new van models for 2015 and how manufacturers are addressing fuel efficiency through technology....More
Nov 19, 2014

The simplest way to save time and frustration when managing your business with software

Are you still using pen and paper to manage your business? Do your field techs still manually fill out carbon copy work orders and drive them back to the office every day?...More

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