Airflow, Diagnostic, Home and Building Performance, Installations, NCI Article Library, Testing and Balancing
Duct Loss Test Methods - Which to Use When? By: Rob "Doc" Falke, NCI President NCI has a number of duct loss test methods that can help identify defects in duct systems. But when it's time to test in the field, you have to quickly determine what test will be most...
Carbon Monoxide, Combustion Safety, Diagnostic, Home and Building Performance, NCI Article Library, Static Pressure Testing, Ventilation
Mechanical rooms housing heating equipment are required to maintain a neutral or slightly positive pressure to prevent combustion gasses from being pulled back down the flue into the room. The only appliances that this would not affect would be sealed combustion or...
Duct Renovation, NCI Article Library
Many performance-based contractors have learned a few tricks that help enable effective duct system renovations when access to the existing duct system is limited or challenging. Let’s take a look at a few of these solutions to improve duct performance when ducts are...
Best Practices, NCI Article Library, Technician Tips
Most of us who seal metal ducts using mastic know how hard it is to neatly brush the mastic on joints. This is no big deal on ducts in attics or crawl spaces, where they'll never be seen, but can look kind of sloppy on exposed ducts in basements and equipment rooms....
NCI Article Library, Safety, Ventilation
Many of us have been taught that if draft in the flue is .02" W.C. or higher, everything is working fine. This is a very dangerous assumption because you don't have enough information to make an educated diagnosis. Remember, none of the above methods can differentiate...
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