I am a residential installer but from time to time I do some service calls. I’m having a hard time wrapping my head around what static pressure is and why it’s important
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[Static pressure](https://airfixture.com/blog/what-is-static-pressure-in-hvac) in relation to HVAC systems is the “resistance to airflow in the ductwork or other components within the system.” Higher static pressure = more work the HVAC has to do to force air into the room/building. An imbalance of static pressure and blowforce (“dynamic pressure”) can burn out the fans/motors in an HVAC or lead to hot/cold spots in a building. (According to the article linked, the most common cause of high static pressure is poor ductwork.)
Generally, static pressure refers to the amount of pressure exerted by a fluid (liquid or gas) at rest (Pressure = Force/Area).
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