The pressure of a fan can be determined by measuring the air velocity at the fan outlet and using a pressure gauge to calculate the pressure.
The formula for calculating air volume of a fan using pressure is: V = (Q x 60) / P, where V is air volume in cubic feet per minute (CFM), Q is air flow rate in cubic meters per hour (m3/h), and P is pressure in inches of water gauge (in. wg).
Yes, the air volume and pressure of a fan can change over time due to factors such as changes in air temperature, changes in fan speed, and changes in the environment.
The size of a fan can affect its air volume and pressure as larger fans typically have a higher air flow rate and can generate higher pressures, while smaller fans may have a lower air flow rate and generate lower pressures. However, the design and efficiency of the fan also play a significant role in determining its air volume and pressure.
In addition to air flow rate and pressure, other factors to consider when calculating air volume of a fan include the fan's efficiency, the type of fan (e.g. centrifugal, axial), and the specific application and environment in which the fan will be used.