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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So there’s 2 main types of pressure in ductwork/HVAC; velocity pressure and static pressure.
Velocity pressure is the force of the air moving forward. Think about the speed at which it leaves the air diffuser, often measured in FPM (feet per minute).
Static pressure is the pressure of the air in all directions within a duct. Simply put, it’s a measure of your air going forward (same as velocity) but also a measure of the air pushing on the top, bottom and sides of your ductwork. If your static is too high, your air will not only come ripping out of your diffusers, but your duct will start to buckle outwards in all directions, and eventually break if the pressure builds. This is often measured in WC (water column).
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