As you have known, you must know what the capacity of a fan is before you consider opening a damper or increasing the fan speed. Doing so may not be safe—it could result in an overloaded motor, for example, or an unusually high power consumption—so you should be able to predict the results of any …
The fans are tested for field performance by measurement of flow, head, temperature on the fan side and electrical motor kW input on the motor side. Air flow measurement Static pressure Static pressure is the potential energy put into the system by the fan. It is given up to friction in the ducts and at …
Air Density (Temperature and Altitude) Air density is a variable of elevation and temperature, and both these variables affect fan air performance. Air density will affect the total pressure that a fan can generate and the horsepower required to move the air. Most fan performance is published at a density based on air at 70°F …