Just because our industry talks about proper airflow, it doesn't mean we’re doing much to address it. Airflow must be measured, plain and simple. Duct design and duct tightness won’t assure proper airflow.
If you’re in doubt about how a fan was rated, dig a little deeper into the footnotes and a lot of questions will be answered. As you become a student of fan-performance tables, you begin to see truths about airflow that enable you to solve issues beyond the skill level of your competition.
To understand airflow, one must have a firm grasp of the rules driving its characteristics and behaviors. Many of the most complicated issues a tech encounters often tie to an airflow problem, so let's look at five airflow rules that can help anyone in the industry master the airside of the profession.
Start testing the right way and make sure you have a complete list of possibilities. Otherwise, you’re guessing at the solution and possibly creating more problems. Remember: if you don’t measure, you’re guessing.
Performance-based contracting involves HVAC professionals measuring the live, installed field performance of systems to ensure customers are getting what they’ve invested in. The field-performance measurements obtained by an HVAC professional are then used to rate the operating efficiency of the installed system.
Many professionals are wondering exactly what’s involved in this test, the equipment that’s needed, third-party testing, and how to pass these tests. Let’s take a look at some of the basics for residential duct-leakage testing.