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Ductwork design and troubleshoot
How ductwork is designed check here
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Ductwork is the way we transfer heated or cooled air from its source to the conditioned space. The design of this system may seem simple. It is anything but. The video below introduces you to the basic design of ductwork.
Static pressure is the pressure created by the fan to pressurize the ductwork both positive in the supply duct, and negative in the return duct.
The video below demonstrates how to test the return air static pressure.
The air filter is a part of the ductwork system. It is there to clean the air that passes thru the ductwork and air handler. Media type air filters rely on a material such as paper that has small holes for air to pass thru, but particles larger than the holes get caught. The video below describes some different types of media type air filters.
When we discuss filters, one of the issues we deal with is the pressure drop across the filter. Anytime we put a device in the airflow, there is a reduction in airflow caused by the friction of the air against the device. Filters cause considerable friction mostly because they effectively reduce the size of the ductwork. Excessive pressure drop by filters is one of the leading causes equipment failure. Usually caused by overheat and limit shutdowns.