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A good idea, should you have some extra general exhaust (not toilet or lab hood exhaust, of course)left over as a result of meeting ASHRAE 62 requirements, is to circulate a sufficient quantity of such exhaust through the switchgear room to maintain both humidity and temperature control. The...

A client of mine asked me about a product that is being pitched to them to increase their chiller efficiency by eliminating coagulated refrigerant oil buildup on the inside of the refrigerant piping. The product he mentioned was "Proateq" (www.molecular-solutions.com). Has anyone heard of these...

There is an example drawing in NFPA 90A that gives many common duct and damper possibilities. Good info in a small (one page) package!

Here in Houston (International Building Code), the rule is that you need a defined minimum air velocity (measured at several places across the door area and then averaged. I am not at my office and I can't remember that exact number) across the door on the floor of the fire with the stair doors...

I would shy away from using a split system with a manual O/A damper set to a fixed volume of air. The problem is that when the compressor cycles off with the fan running, the O/A is brought in untreated. In more humid climes such as coastal areas, the amount of humidity introduced when the...

Placement of the humidifiers downstream of the final filters is preferred for the reasons specified above. Allowing 15' or any other reasonable amount of distance between the humidifier will help if it is placed in front of final filters, but it doesn't keep the damage to the filters from...

One consideration is the fact that infiltration does nothing to dehumidify the air before it enters the space. This isn't much of a concern in drier climes, but in more humid environments it is of major concern. Positive pressurization of the building through a pre-conditioned central supply...