![]() ![]() Standard Air Conditions are the assumption that air has a density of about 0.075 pounds per cubic foot, at 70F, at sea level, with 0% relative humidity. For the purpose of gauging fan performance, air density is assumed to be standard. Furthermore, air density is affected by 3 key components: temperature, altitude, and humidity. Fan performance is directly correlated to this, in the sense that performance changes the moment air density becomes higher or lower. However, there are factors that may impact the ability to measure this consistently, such as whether air density is kept as static. In the graph below, the manometer makes use of liquid pressure to determine “h” = the displacement of the liquid caused by airflow generated in the form of pressure or a vacuum.įig. ![]() Pressure-indicating instruments, such as manometers, are used to capture the measurement of air pressure. It’s friction created from air passing through ducts and pipes. Static PressureĪir pressure is the resistance pressure that the fan has to blow against in order to carry the air towards the intended direction, usually measured in water gauge (in. Airflow is measured from the operating static pressure relative to the fan speed (or RPMs). This keeps the air clean, so you need a fan system that can move up to 300 to 600 CFM for 2000 ft3 space. This is particularly important in industrial areas where a steady airflow is required to remove generated fumes. Airflow requirements vary on the specific setup but are usually dependent on the volume of space that requires air to move through. The first consideration is the fan’s airflow or its volumetric flow rate, usually measured in CFM or cubic feet per minute. In a fan performance curve, the graph shows 3 axes, namely:īy breaking down these measures, you should be able to understand the 3 key aspects you need to look out for in terms of a fan’s capability. For industrial fans, these types of information are depicted in fan performance curves. These typical tests are aimed to capture performance ratings and these standards define a uniform approach in measuring that. defined laboratory test methods for industrial fans under ANSI-AMCA STANDARD 210 (or the Laboratory Methods of Testing Fans for Certified Aerodynamic Performance)or ISO Standard 5801. However, to ensure that all manufacturers adhere to the same standard, AMCA or the Air Movement and Air Control Association International, Inc. This particular performance table captures the necessary information that matches the customer’s desired performance. Across the industry, industrial fan manufacturers showcase their products side by side the performance rating tables in catalogs. ![]()
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