ANSI/AMCA 250-22 Laboratory Methods for Testing the Performance of Jet Fans

The standard "ANSI/AMCA 250-22 Laboratory Methods for Testing the Performance of Jet Fans", published jointly by the American National Standards Institute (ANSI) and the Air Movement and Control Association (AMCA), an international standards development organization, describes laboratory methods for determining the specifications required to verify the manufacture of jet fans for specified performance characteristics (e.g., thrust and airflow) for longitudinal applications. This standard does not cover fans designed for duct applications or fans designed solely for air circulation (e.g., ceiling fans and table fans). Furthermore, the test procedures described in this standard apply only to laboratory conditions. Measurement of performance under in-situ conditions is outside the scope of this standard.

Parties to a warranty test may agree in writing on exceptions to this standard prior to testing. However, only tests that do not violate any of the mandatory requirements of this standard are considered to be tests conducted in accordance with this standard.

For the purposes of this standard, the following terms and definitions apply:

The term air is used to refer to the mixture of various gases that make up the earth's atmosphere and any gaseous medium that is often measured, moved or controlled in an HVAC system.
Standard air refers to air with a density of 1,2 kg/m3, a specific heat ratio of 1,4, a viscosity of 1,819 × 10-5 pascals/second, and an absolute pressure of 101,325 kPa. Air at 20 degrees Celsius, 50 percent relative humidity, and 101,325 kPa has approximately these properties.
Absolute pressure is the pressure above a perfect vacuum and is the sum of gauge pressure and atmospheric pressure. The value is always positive.
Barometric pressure is the absolute pressure exerted by the atmosphere at a measurement point.
Dry bulb temperature is the air temperature measured by a temperature sensing device without any changes to compensate for the effect of humidity.
Static pressure at a point is that portion of the air pressure that exists solely by virtue of the degree of compression. Expressed as gauge pressure, it can be negative or positive.
Volumetric air flow rate is the volume of air passing through a given area per unit time.

Jet fans generally transport air from supply points to exhaust points in the basements. Main fans ensure the overall effective air change per hour in the car parks for effective smoke removal during normal operation and smoke extraction during fire mode.

Jet fans generally come in two types: axial and centrifugal. The main difference between the two is the cloud they create. An axial jet fan creates a horizontal cloud, while a centrifugal jet fan creates a slanted cloud. This slanting helps to avoid joists and obstacles. An axial jet fan is good for creating air movement over parking lots as well as driveways. A centrifugal jet fans usually have a lower profile, so they can be used in areas with lower ceilings. A centrifugal jet fan is suitable for parking lots with high ceilings, as the slanted head allows the jet fan to be mounted on the ceiling while still providing air movement closer to the ground.

In short, a jet fan is designed to move large volumes of air through the development of thrust. This is achieved by creating a concentrated high-speed jet stream that initiates air movement and is based on a law of physics.

Our organization has a strong staff that closely follows the developments in the world in the field of science and technology and constantly improves itself. Among the numerous test, measurement, analysis and evaluation studies provided for businesses in various sectors, there are also test services in accordance with the standard "ANSI/AMCA 250-22 Laboratory methods for testing the performance of jet fans".