Reading Air Velocity

By Eric T Jenison, NEBB past President & FEBB Past President Having proctored over 100 practical exams one observation seen constantly, is a lack of understanding of how to properly read air velocity to obtain the CFM present. It is a straight forward process that is not performed correctly very often. Here is a little history lesson: when starting in …

Flow Hood Calibration

Is my flow hood in calibration? It was calibrated with the last year! By Eric T Jenison, NEBB past President & FEBB Past President The following information is based on my experience with Shortridge Flow Hoods. Flow hoods have been around since the mid 60’s in various forms. Flow hoods are a device that reads airflows from various air outlets …

Flow Devices and Hand Wheel Settings

by Brian Kaupp, TBE — Southern Independent Testing Agency Having a general understanding of flow devices or balancing valves is important for the Owners, Architects, Engineers, and Mechanical Contractors. Simply put, it is specified and installed to set a flow (gpm) to a predetermined value, which is best determined by utilizing a digital hydronic meter to measure a pressure drop. …

Fan and Pump Issues

by Charles W. “Chuck” Kaupp Over the years of testing, it has amazed us how often equipment test results, from a fan or a pump, do not follow the performance curves. In the last few years, two unusual issues arose, relating to an exterior wall mounted kitchen hood exhaust fan and a small 30 GPM circulator pump. Problem Issue #1 …

Pump Gauges

Location, Location, Location by Brian C. Kaupp The location, as well as the installation, of pump gauges has been a problem in the HVAC industry for years. There is a lack of information on proper installation and the understanding of why the location of the pump gauges is extremely important for evaluation of the performance of the pump. When evaluating …