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Looking for information related of which NFPA code permit or not-permit the use of PVC and CPVC pipes in HVAC applications (chilled water, ahu drains, condensated water, other). International Plumbing Code permit the use of PVC in HVAC applications, but and not sure about NFPA. regards

looking for information (weight) of old fashion Marley cooling tower NCW 8707. made of wood and asbesto. regards

Looking for information (literature, operation and service) of old fashion chiller Trane model CG 125 C. regards

Thank Marcoh, The point is ...we have a typical Multi-zone AHU using face/by pass (blow-thru) to control the temperature. But we are going to replace by Draw-thru AHU (plug fan)using VFD and keeping the section of dampers (9 zones) just after fan section. My question is which kind of AHU...

My point is, Why to use DT in multi-zone application when using VFD?? Better performance of controls??

Looking for information related to correct AHU configuration for multi-zone purpose using VFD and zone dampers. blow-thru and draw-thru??? I search books and internet and the information is not clear. some times indicated BT other DT. I feel the only difference its related to sensible rise and...