Former HVAC and controls guy here. If you are going to the trouble of putting in a PPS, why not measure and control the fan speed based off of static pressure

Former HVAC and controls guy here. If you are going to the trouble of putting in a PPS, why not measure and control the fan speed based off of static pressure inside the space? You could measure your static pressure at a point furthest from the fan or you have multiple static sensors and select/control based off the lowest reading. The pressure only needs to be just slightly above ambient to keep the dirty ambient air out of the home. Providing unnecessary extra flow/pressure is doubly bad - one because your are spending extra energy to over-pressurize the space, two because your exchanging more outside air and thus the delta T between inside and outside. Another consideration is that if your flow/pressure is too high, you'll have trouble trying to open/close exterior doors.