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fabric filter
filter having a textile-based filter medium.
facade area
area of the facade, including overhanging soffits, cornices, and protruding columns, measured in elevation in a vertical plane parallel to the plane of the face of the building. Nonhorizontal roof surfaces shall be included in the calculation of vertical façade area by measuring the area in a plane parallel to the surface.
face area
total plane area of the portion of a grille, coil, or other item bounded by a line tangent to the outer edges of the openings through which air can pass.
face velocity
the rate of air movement at the face of the device (airflow rate divided by face area), expressed in m/s (fpm) to three significant figures.
facility guide
a basic building systems description and operating plan with general procedures and confirmed facility operating conditions, set points, schedules, and operating procedures to properly operate the facility.
facility management system (FMS)
see EMS, EMCS, BAS, and BMS.
factor of safety
ratio of a normal working condition to the ultimate condition, such as, in strength of materials, the ratio of working stress to ultimate strength.
Fahrenheit temperature
temperature scale used with the I-P system in which, at standard atmospheric pressure, the boiling point of water is 212°F and its freezing point is 32°F; absolute zero is minus –459.69°F.
(1) position or mode of operation a controlled device takes on removal of the control signal and/or power. (2) to return to a position that, on loss of control system power, allows the controlled system to go to a safe mode.
failure response
actions performed by the maintenance department resources that are expended or reserved for dealing with interruptions in the operation or function of a system or equipment under the maintenance program. These responses have two types of classification: repair and service.
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About ASHRAE Terminology

ASHRAE Terminology, a free resource, is a comprehensive online glossary of more than 3700 terms and definitions related to the built environment, with a focus on heating, ventilating, and air conditioning (HVAC), as well as refrigeration, building envelope, electrical, lighting, water and energy use, and measurement terms.

This searchable glossary was designed for use by engineering professionals but is also useful for architects, building owners and operators, educators, public officials, and homeowners.

The terms in ASHRAE Terminology have been assembled and defined and are updated on an ongoing basis by ASHRAE Technical Committee (TC) 1.6, Terminology. TC 1.6 is concerned with terminology, nomenclature, definitions, abbreviations, symbols, and the International System (SI) and Inch-Pound (I-P) units used in the fields of heating, ventilating, air conditioning, water heating, and refrigeration.

To request a free electronic file of the complete list of terms and definitions, email ashraetermseditor@ashrae.org.