Static Pressure
Why is my hood fan so loud but not sucking air?
Equivalent Duct Lengths
This is usually caused by "static pressure loss" from too many 90-degree elbows or a duct diameter that is too small. We calculate the "equivalent duct length" to ensure the blower isn't choked by the infrastructure.
The resistance air faces within ductwork; critical for selecting the correct blower power for long or complex runs.