ANSI AMCA 99:2016 pdf download.Standards Handbook.
ANSI AMCA 99 serves as a collection of information that can be used in the development of other AMCA documents.
It is recommended that the definitions in this document be used in all standards and publications. However, standard and
publication developing committees retain the authority to create and maintain a definition specific to their document.
3. Definitions
See Annex B for ISO definitions
3.1 The AMCA vocabulary: definitions
Abrasion Resistant Fan (or Damper)
A fan or damper having parts subject to wear that are constructed of abrasion resistant and/or easily replaceable materials.
*See Annex B for ISO definition of this term
Absolute Pressure
The value of a pressure when the datum pressure is absolute zero. It is always positive.
Absolute Roughness
A measure of surface unevenness; the distance between high and low points on a surface.
Absolute Viscosity; see Viscosity
Accessory; see Appurtenance
Acoustic Attenuation Device
Any component having sound absorption as its primary function.
Acoustic Intensity; see Sound Intensity Level
Acoustic Media
Sound-absorbing material.
Acoustic Media Covering
The material that is used as a facing or bagging to protect the acoustic media from moisture absorption or air erosion.
Acoustical Duct Silencer
An air duct section containing sound-absorbing materials that reduce the transmission of sound through the air passage.
Acoustical Louver
A louver incorporating sound-absorbing material to reduce sound transmission across an opening.
Active Noise-Cancelling Device
A device that reduces sound by introducing a sound that is equal and opposite phase.
Actual Cubic Feet Per Minute (ACFM)
Actual volume airflow rate through a plane of measurement; at the defined air density, expressed in ft3/min.
Actual Cubic Meters Per Second (ACMS)
Actual volume airflow rate through a plane of measurement; at the defined air density, expressed in m3/s.
Actuator (Operator)
A mechanism attached to a device (for example, a damper, adjustable louver or fan) to move its blades through a
specified range of motion. An actuator may be manually, electrically, pneumatically or hydraulically powered.
Adjustable Louver
A louver in which the blades may be rotated either manually or mechanically.
Adjustable Pitch
The ability to mechanically alter the angle (pitch) of an impeller blade.
Air
Term used as abbreviation for “air or other gas”; a mixture of gases and a term commonly used to denote any gaseous medium measured, moved or controlled and that may include solid or liquid particulate.
*See Annex B for ISO definition of this term
Air Curtain
A directionally-controlled stream of air moving across the entire height and width of an opening that reduces the infiltration or transfer of air from one side of the opening to the other and/or inhibits the passage of insects, dust or debris.
Air Curtain Average Core Velocity
The average of air curtain core velocities measured along the air curtain width at a defined plane.
Air Curtain Core Velocity
The maximum air velocity of the air curtain as measured across the air curtain depth at a specified distance from the discharge nozzle.
Air Curtain Depth
The airstream dimension perpendicular to both the height and width of the opening being protected; the short dimension of the airstream.
Air Curtain Discharge Angle
The angle between the plane of the protected opening and the direction in which the airstream leaves the discharge.
Air Curtain Discharge Nozzle
An air curtain unit component that directs and controls the airstream.
Air Curtain Discharge Nozzle Depth
The inside nozzle dimension perpendicular to both the direction of airflow and the width of the airstream; the short nozzle dimension.
Air Curtain Discharge Nozzle Width
The inside nozzle dimension perpendicular to the direction of airflow and parallel to the width of the airstream; the long nozzle dimension.ANSI AMCA 99 pdf download.