Consulting-Specifying Engineer - October 2007 - (Page 36)

Codes & Standards install it in the floor slab, making installation and maintenance easier. The 90A standard also lists specific requirements for the provision of smoke dampers in an air-handling unit (AHU), as opposed to smoke dampers out in the duct distribution portion of the system as discussed above. Smoke dampers are required in HVAC systems with a capacity greater than 15,000 cfm in order to isolate the AHU from duct distribution. The smoke damper on the return side of the system should be installed upstream of its fan. The smoke damper on the supply side of the system should be installed downstream of its supply fan. Exceptions include systems located on the floor that they serve exclusively, as well as systems positioned on a roof that control only the floor immediately below. Finally, 90A defines a need for ductmounted smoke detectors downstream of all filters, but upstream of all branch takeoffs for supply fans with capacities greater than 2,000 cfm. The same goes for those of return fans with a capacity greater than 15,000 cfm. Additionally, duct-mounted smoke detectors also are required in each return duct inlet that serves more than one story for systems with a capacity of greater than 15,000 cfm. These smoke detectors also should be able to sense smoke on a particular floor of multi-story building. Duct-mounted smoke detectors, however, are not required in a return air system if the spaces served by the HVAC system are protected by ceiling-mounted smoke detectors. Duct-mounted smoke detectors are also not required downstream of exhaust fans. Sequence of operation. Once all system components have been furnished and installed, engineers need to help clients and contractors understand how life safety systems work. The 90A standard requires smoke dampers installed at the AHU to close automatically when the HVAC system is not in operation. Activation of any duct-mounted smoke detector noted above shall automatically stop the fans associated with the HVAC system and close the smoke dampers, unless the system is intended to function as part of an engineered smoke control system. Last but not least, acceptance testing is required in order for all parties to confirm that the systems have been installed and are operating according to design requirements. A form of commissioning, acceptance testing must occur even if the owner chooses not to have any other elective commissioning performed on other building systems. A masterpiece in ﬁre protection. BlazeMaster® Fire Sprinkler Systems. For reliability, ease of installation and cost-efficiency, more specifiers choose BlazeMaster® CPVC Fire Sprinkler Systems for use in residential, multi-family, high-rise, hospitals and educational facilities. And with good reason. n n n n n made from a lightweight, semi-flexible material that needs no pre-fabrication and alterations can be handled on-site. With over one billion feet of piping systems installed in over 50 countries since 1984, and with more listings and approvals than any other non-metallic fire sprinkler piping system, BlazeMaster is the most recognized and specified non-metallic fire sprinkler piping system in the world. For fire protection that’s corrosion-resistant, longer lasting, and easier and less costly to install, call 888-234-2436. Or visit our website at www.blazemaster.com. Approved by all major building codes and complies with NFPA 13 Low flame/smoke generation allowing for installation in air plenum spaces Backed by national network of dedicated CPVC fire protection specialists to provide on-the-job assistance Only ancillary system compatible program in the world Largest national non-metallic piping system installation training program No overhead sprinkler system is easier to install than a BlazeMaster CPVC system. From the inventors of CPVC, it’s BlazeMaster® is a registered trademark of The Lubrizol Corporation © 2007 The Lubrizol Corporation Input #223 at csemag.com/quickResponse 36 Consulting-Specifying Engineer • OCTOBER, 2007 http://www.blazemaster.com http://www.blazemaster.com http://csemag.com/quickResponse

Table of Contents Feed for the Digital Edition of Consulting-Specifying Engineer - October 2007

Consulting-Specifying Engineer - October 2007 Contents On the Web In the News M/E Roundtable How To Beat the Energy Codes Professional Practices Codes & Standards A Capital Job on Engineered Buiding Systems Going Green in Data Centers Overcurrent Protection: Fuses or Breakers? Third-Party Liability Management Report New Products Product Spotlight Jobs/Classifieds Specifier's Notebook

Consulting-Specifying Engineer - October 2007

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.