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Articles by Steven G. Liescheidt, P.E., CSI-CCS, CCPR

Motors For Use With VFDs

January 9, 2012
The questions can pile up quickly when it’s time to specify a motor to pair with a variable drive. The information available sometimes leaves one wondering just as much about the information that is unavailable. Will a decision hold up not only in the actual application but also possibly in court? Wade into compatibility, spec terms, partial loads, and more as we try to get this motor running.
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Seismic & Wind Concerns

May 5, 2011
Earthquakes and strong gusts are threats in the physical world that creep into the HVAC design world of isolators, supports, and special louver considerations. Furthermore, a new legal world in terms of codes, insurance, and liability can leave inattentive engineers, owners, and manufacturers quaking in their boots. Read on to stay safe in more ways than one.
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VAV For Laboratory Spaces

April 1, 2011
Terminal devices, pressurization, supply air, proper exhaust … those factors and more go into a well designed VAV system for sensitive lab applications. From general tips to changing details such as fabric duct elements, booster fans, and a new AMCA standard, the author equips you to succeed in one space that is no place for experimentation.
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Commercial Kitchen Ventilation Design Considerations

September 1, 2010
After reviewing the methods and pros/cons of various hood designs, the author moves on to ventilation alternatives, details like equipment placement and insect control, and maintenance tips. Finish up with a design checklist that will never go stale, garnish with reading recommendations, and you’re ready to serve up a healthy design the next time an order is placed.
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PerSPECtives: The Product Selection Matrix

November 1, 2006
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July 1, 2006
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perSPECtives: TAKE IT FROM The Top

May 1, 2006
Although it is generally understood that the documents prepared by the architect and engineer are not used to describe the means and methods of construction, referring to these documents as "construction documents" can imply otherwise. This is why it is good to have a clear understanding that the "contract documents" are the documents that include the drawings and specifications that communicate the design intent of the architects and engineers. The actual construction procedures, means, and methods are the responsibility of the contractor(s).
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perSPECtives: SPECIFICATION Language

March 1, 2006
In the life of a building design and construction process, various formal and informal forms of communication are used - written or verbal communication and body language are a few. Communication influences decision, and these decisions ultimately need to be documented in formal written formats such as meeting minutes, memos, phone logs, and contract documents (specifications and drawings).
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PerSPECtives: Methods of Specifying

January 3, 2006
Different styles have different demands (and benefits).
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Design Flaws

Following up on Howard McKew's April "Tomorrow's Environment" column: Have you ever thought twice about reporting problems with another firm's design? What did you do?
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