Specifically, static pressure means turning the fan to the maximum gear, sealing the outlet of the wind and the pressure in the bellows.
The technical standards of different manufacturers are different, and the static pressure of various machines is different, but the definition and function of static pressure are the same.
Answer supplement
Generally, we call the pressure at the tuyere residual pressure. This is the actual pressure at the outlet of the air duct after the static pressure is reduced by various resistances.
Answer supplement
Every device, such as valve, elbow and air duct itself, will have resistance to wind. When calculating the geomantic force, it is necessary to calculate whether the residual pressure pair meets the air supply requirements. I can't give the data for the static pressure of 300 Pa, because the resistance inside the fan, such as the heat exchanger, is unknown.
First, measure the residual pressure of the fan, and subtract the pressure loss (called local resistance) caused by the valve, elbow and reducer. Behind the tuyere. This data is the pressure you finally spend on the air duct (called resistance along the way). According to the pressure loss per 100 meter, how far the air duct can send can be calculated. Of course, the terminal tuyere must also maintain a pressure of tens of pa, and various resistance coefficients can be found in the manual.