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hali24953
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Hi, Looking at blower fan charts, why does the static pressure drop with increased CFM, what makes sense to me should be a pressure difference rise with increasing CFM.
Yes, the fan curve alone won't tell you the performance of the fan, just the performance range. To find the actual performance you need to match the fan curve to the system resistance.hali24953 said:Does that mean that fan charts tell what CFM flow will the fan be able to give at a given resistance to its inflow?
The resistance coming from a pipe wall for example, a fan at the outlet will be able to suck the air out at a given CFM overcoming the wall resistance given in terms of Pa/inches of water ?
A blower fan is a mechanical device that is used to create a flow of air or gas. It consists of a motor, blades or impellers, and a housing. Blower fans are commonly used in heating, ventilation, and air conditioning (HVAC) systems, as well as in industrial and commercial applications.
"CFM" stands for cubic feet per minute and is a unit of measurement used to describe the volume of air that a blower fan can move in one minute. It is a measure of the fan's airflow capacity and is an important factor in determining the fan's performance and suitability for a specific application.
The pressure of a blower fan is typically measured in inches of water gauge (in. WG) or pascals (Pa). These measurements indicate the amount of force that the fan is able to generate to move the air or gas through a system. The higher the pressure, the more resistance the fan can overcome and the farther the air can be pushed.
The cfm and pressure of a blower fan can be affected by various factors, including the size and shape of the fan blades, the speed of the motor, the design of the housing, and the density of the air or gas being moved. Other factors such as obstructions in the airflow path or changes in temperature and humidity can also impact the performance of a blower fan.
Yes, the cfm and pressure of a blower fan can be adjusted by changing the speed of the motor or by altering the design of the fan blades or housing. Some fans also have adjustable dampers or louvers that can be used to control the direction and volume of airflow. It is important to consult the manufacturer's instructions and recommendations when adjusting a blower fan to ensure safe and optimal performance.