Autodesk 235B1-05A761-1301 - AutoCAD MEP 2010, User Manual

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floating viewports Boundaries created in paper space that display views. See also paper space.
floor drain A pipe or channel to remove water from under a floor in contact with soil.
flow arrow Annotation used to graphically show the direction that fluid, such as water, travels through a
pipe or series of pipes. Typically indicated by an arrowhead in the line representing the pipe(s).
flow diagram A symbolic drawing, typically a 2D plan, that shows the logic and operation of a building
system.
flow direction The direction in which a volume of fluid moves.
flow pressure The pressure within the water supply pipe by the faucet or water outlet while water is flowing.
flow rate The volume of fluid that passes through a pipe in a specified period of time.
flush valve A valve used for flushing toilets.
forced-air system A type of heating system in which heated air is blown by a fan through ducts to rooms.
free-standing symbol An AutoCAD block that is inserted into a drawing without connecting it to other
objects or anchoring it to a schematic line.
fuses Replaceable safety devices used to protect an electric circuit from excessive current.
gas meter An instrument for measuring and recording the amount of gas flowing through a pipe.
gathering The tapered section of flue duct or air duct that forms a transition between the duct passage and
the flue.
gauge The thickness of the material of a part.
gbXML For Green Building Extensible Markup Language. This XML format is designed to store and transfer
building information in CAD drawings. gbXML is used to store space and zone data, and can be used in
external analysis tools to determine energy requirements.
GFCI (GFI) For Ground Fault Circuit Interrupter. A type of circuit breaker or receptacle device (commonly
required in kitchens and bathrooms) that helps to safeguard against shocks.
glued connection A type of permanent pipe connection used to join individual pipe segments; involves
applying a watertight adhesive to the pipe segments.
governor A device that gives automatic control of temperature or pressure.
grids AEC objects on which you can anchor other objects, such as columns, to constrain their locations.
grips Control points used to modify objects such as spaces, schematic symbols, and duct segments.
grooved connection A type of detachable pipe connection used to join individual pipe segments. The pipe
segments have male or female grooved ends to create a watertight joint.
ground (1) The endpoint for a current.
ground (2) A large conducting body (as the earth) used as a common return for an electrical circuit in order
to prevent the buildup of voltages that may result in hazards to connected equipment or to persons.
grounded conductor Also referred to as the neutral conductor. The return path for current in a normal
(non-faulted) electrical system.
grounding conductor Also referred to as the safety ground or equipment ground. Removes the potential
for electrical shock of persons in contact with energized metal parts due to a ground fault.
hand wheel A wheel, such as a valve wheel, that is turned by hand.
handle A unique alphanumeric tag for an object in the AutoCAD database.
810 | Glossary