Areas are measured in square units (like square feet). Based on the application, four parameters need to be determined. Airflow per ton is 2,775 cfm / 10 tons = about 278 cfm per ton. Volume flow is usually measured in Cubic Feet per Minute (CFM). Now that you have the total pressure, you will have to measure the air speed in feet per second. Fan specification is usually not a precise science and can be done confidently when the fan application is understood. Measure the air speed. Simply put, the higher the CFM, the more air the hood can remove. These combined factors establish the air moving capacity of a fan. Volumes (like a room full of air) are measured in cubic units — CFM determines how much cubic feet can be moved or exchanged each minute. This means a blower that is moving 1000 CFM cannot use more than 580 Watts of power to do so. The fan performance data in Table 7 shows that fan #4 provides 2,775 cubic feet of air per minute (cfm) against a pressure of 1 inch. Fan (blower) efficacy is called out in various codes and standards such as California Energy Commissions requirement that all blowers perform at or below a 0.58 fan efficacy. BASIC FAN LAWS Existing Flowrate (CFM): Existing Static Pressure (in. The amount of air depends on some other factors as well, such as the diameter and shape of the blades, speed at which the blades turn (revolutions per minute or rpm), horsepower (hp) of the motor, and overall fan design. The ventilation power of your range hood is measured in cubic feet per minute (CFM). Not everyone is going to take a look at CFM, but for those who do it is a helpful tool. Concept of Air Velocity can be used in air conditioning, heating and ventilating work. So, to check and set speed on an ECM based furnace you would need to check the TESP in cooling mode, and then refer to the manual. Enter value, select unit and click on calculate… CFM Calculation for Exhaust Fan. Air Flow formulas CFM = Duct area sq ft x Velocity Standard Air= 70F @ 29.92” HG (Mercury) 1 cubic foot of standard air = 0.075 pounds 13.3 cubic feet of standard air = 1 pound FAN LAWS: Remember RPM is interchangeable for CFM Note: new is the same as 1 and old is the same as 2 Fan Law #1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ⎟= ⎠ ⎞ ⎜ ⎝ ⎛ old In our PSC example, we would likely have had to slow the fan speed by 7-15% to give us the ability to get much closer to our target of 350 CFM/ton. Obviously Place the vane anemometer at different points of the fan face, in order to take more than one velocity measurement. N f = Speed of fan (rpm) N m = Speed of motor (rpm) Note that the ratio (Nf/Nm)2 reflects the fan inertia to the motor. Areas are measured in square units (like square feet). H2O): Existing Horsepower (HP): Existing Speed (RPM): New Speed (RPM): New Flowrate (CFM): They are: Fan Model Cubic Feet per Minute (cfm) Static Pressure (Ps) This value is within the recommended range for hay drying given in Table 1 (see airflow recommendations by fan purpose section above). This fan calculator is typically used to calculate the CFM or cubic feet per minute of air exchange that may be desired in a building. CFM For this you will need a vane anemometer. A reduction in speed between motor and fan reduces the effect of load inertia on accelerating torque; conversely, an increase in speed between motor and fan increases the accelerating torque required. To determine how much CFM you need for your range hood, consider the following: CFM stands for Cubic Feet per Minute and is the most common way to measure airflow. In this case, some fan specification work must be done. to use or even what cfm is necessary. 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