Consulting-Specifying Engineer - September 2008 - (Page 18)

M/E Roundtable (2008) gives the latest thinking for our topic and should be part of the reference materials used for design. The International Mechanical Code has been regularly updating and improving the requirements for commercial hood exhaust systems. C S E : H ow d o es p ro p e r kitc he n venting play into codes? What should engineers be aware of? McGuire: Codes are written to protect the public, while also protecting property in certain areas. Since codes become part of a law in whatever jurisdiction adopts them, they need to be considered legally binding. Building officials commonly take a standard code, such as the International family of codes, and then modify it to meet specifics for the jurisdiction. They, in turn, pass it on for adoption by the legislators. In 1998, NFPA issued its document, NFPA 96. It was significantly revised in 2001, in 2004, and again in the latest 2008 edition. Likewise, the International Mechanical Code was issued in 1998, 2000, 2003, and 2006. Each of these issues contains major changes in Section 506 “Commercial Hood Ventilation System Ducts and Exhaust Equipment.” Each edition incorporated important items. However, legislators were not sitting around waiting to pass new laws to make these changes binding by law, and few would consider adopting something they had not seen. Such an approach would require accepting changes without a vote. What has happened is a vast variation in legal requirements across the United States. All the changes made in these codes, however good they are, do not guarantee that they will be accepted by local authorities since the local building ordinances may not be revised for years. This has resulted in the need for a thorough level of communication with authorities to assure that the design is acceptable. Melink: The main objective of the kitchen ventilation system is to properly capture and remove the heat and smoke generated from the cooking process to ensure a comfortable and safe working environment. As long as your design accomplishes this main objective, you are complying with most, if not all, the code requirements. While this may seem simple on the surface, the reality is there are numerous factors to consider, and experience is an important credential. Fortunately, there is more literature available on the subject today than 10 to 20 years ago, and this can help one climb the learning curve more quickly. VFD-Induced Bearing Currents Kill Motors! Protect Bearings, Prevent Motor Failure! BEARING PROTECTION RING Safely channels harmful currents away from bearings to ground Easy field or OEM installation — in just minutes Maintenance-free, contaminationproof, lasts for life of motor Standard sizes for any motor Split mounting kit simpliﬁes ﬁeld installation on NEMA or IEC motors including those with shaft shoulders, slingers, or other end bell protrusions To download a free technical paper on bearing protection technologies, visit our website: 1-866-738-1857 | sales @est-aegis.com www.est-aegis.com/cse2 Input #211 at csemag.com/quickResponse http://www.est-aegis.com/cse2 http://www.est-aegis.com/cse2 http://www.csemag.com/quickResponse

Table of Contents Feed for the Digital Edition of Consulting-Specifying Engineer - September 2008

Consulting-Specifying Engineer - September 2008 Contents Viewpoint Letters News M/E�Roundtable Selecting Appropriate Egress Strategies Commissioning On-Site Electrical Systems Mentoring Control Engineers and Technicians Casting Call for Cx Case Study New Products Equipment Lifecycles Advertiser Index Green Space

Consulting-Specifying Engineer - September 2008

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