Instead of focusing on the poor work our industry has been plagued with, we decided to dream about how an ideal duct system could be built.

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.

HVAC contractors are always looking for a way to differentiate themselves. Addressing duct leakage is a big opportunity. This is something building professionals are concerned about, so it should be an area of focus for contractors.

The Building Performance Institute Inc. (BPI) has announced the introduction of its Infiltration and Duct Leakage (IDL) certification, a task-oriented credential that verifies a candidate can successfully conduct air infiltration and duct leakage tests to the ASTM E1554-07 standard.