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Two-Minute Duct Performance Test is a step-by-step guide to doing fast static pressure tests in the field.

This data sheet highlights what static pressure is, what duct pressure budgets are, and provides the calculations for determining whether ductwork is sized adequately.

To use this information, you’ll need a manometer, tubing, and static pressure tip to conduct the test.

Just go to,

By registering for free on NCI’s website, access this download and many more.


National Comfort Institute, Inc. Online UniversityFeatured this month is the HVAC for Rookies module of the Customer Service Training series. This module is for those employees with little to no HVAC technical experience and will teach them the basics. It is part of short online courses that helps you with onboarding new employees, teaches rookies the basic fundamentals of HVAC systems, and how each major department in your company works together to achieve goals set by you.

The course covers the foundational structure of a HVAC company, HVAC basics, system performance and so much more.

Discover more at



Measuring static pressure on air handling equipment that has variable-speed fans can be a challenge to both new and experienced technicians.

David Richardson shows that by addressing a few details, your readings will be consistent when you encounter this blower type. He provides three tips you can use the next time you measure static pressure on a variable-speed fan.

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Dominick Guarino, CEO, National Comfort Institute, Inc.THE COMFORT REVOLUTION REVISITED

Back in 2005, Dominick Guarino wrote a column in another magazine that addressed the growing movement now known as High-Performance HVAC contracting.

We believe it is still relevant today. Check it out and let us know if you agree.

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There’s an APP for That …

Are you looking for a great refrigerant charging and diagnostic HVAC app? HVAC Buddy? is for use when technicians are servicing equipment. In fact, using this app, along with your gauges and a thermometer, is a great way to diagnose and determine the right refrigerant charge.

Some features of the app include:

  • Superheat for fixed capillary or subcooling for TXV/EXV
  • Calculates targeted vs. actual subcooling
  • Over 100 refrigerants including newer azeotropic blends
  • Airflow / Delta-T / TEET Calculation
  • Update all values with realtime output.

This app costs $9.99 and is available at both the Apple ( and Google stores (