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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal>I am modeling a fire house. I encountered a problem at the fire truck bay. There is a DX cooling / furnace heating system at the fire truck bay for basic air-conditioning. I am wondering if anyone know how to model a separate emergency exhaust/makeup system for the fire truck bay, which will not affect the sizing of the DX cooling / furnace heating system. The emergency exhaust/makeup system is controlled by the CO sensor and has a duct furnace at the makeup air.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks! <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='font-size:14.0pt;font-family:"Bradley Hand ITC"'>Loi Ng<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Mechanical Engineer</span><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'>, </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>LEED<sup>®</sup> AP</span><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#0070C0'>Diversified Engineering, Inc.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#0070C0'>914 Silver Spring Avenue, Suite 208<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#0070C0'>Silver Spring, MD 20190<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#0070C0'>Tel: 301-565-2000 x 234<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#0070C0'>Fax 301-495-1563 <o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>