by John Krigger | Mar 31, 2022
(0.9 CEU; 55 minutes) Airflow and static pressure are directly related to one another. Measuring static pressure is considerably easier than measuring airflow. Thus, we measure static pressure differences in different parts of a forced air system. This micro...
by John Krigger | Mar 31, 2022
(0.5 CEU; 25 minutes) This 7-minute video explains the process of evaluating and servicing a typical residential HVAC system. The focus is on troubleshooting and logical progression of tasks. Find your procedure guide under the Materials tab. A short quiz will...
by John Krigger | Mar 31, 2022
(0.7 CEU; 45 minutes) Building pressures cause the infiltration of outdoor air and the exfiltration of indoor air. Unbalanced airflow between supply and return ducts can cause positive pressures in some rooms and negative pressures in others. Duct air leakage in...
by John Krigger | Mar 31, 2022
(0.8 CEU; 50 minutes) Professional installers spray foam on surfaces and inject foam into cavities. Sprayed and injected foam are excellent choices for some applications. This micro course shows you a few examples. Spray foam is by far the most common of the two...
by John Krigger | Mar 30, 2022
(0.2 CEU; 20 minutes) This 14-minute video explains how scientists measure the thermal resistance of insulation, using a guarded hotbox. Find your reading assignment under the Materials tab. A short quiz will evaluate your retention of the important information...
