Autodesk 235B1-05A761-1301 User Guide - Page 837

terminal A device, typically located in a branch duct, that dispenses or removes air from the duct system to control the temperature and/or quality of the air. therm A unit of measurement for heat. One therm equals 100,000 BTU. thickness gauge See gauge. threaded A joining method where a pipe is prepared with a male threaded end. The pipe is then inserted and screwed into a female threaded coupling, fitting, or equipment nozzle. title marks Annotation that identifies a drawing. ton A unit of measurement for capacity. Heat pumps and air conditioners are generally sized in tons. Each ton equals 12,000 BTU. It is important to note that actual capacity is not constant; it changes according to outdoor or indoor temperatures. tooltips Tooltips display a description when you hover the cursor over items such as toolbars and icons. transition fitting See reducer. trip lever The handle that is rotated to initiate the toilet flush cycle. trunk The primary duct from which secondary runs branch; typically, the largest duct of the system. type A part's object type, such as duct or pipe, each with unique characteristics and behaviors. unconstrained layout Drawing pipe between an object to a point in space UV filter system A system in which water is sterilized in an ultraviolet chamber, where UV rays purify the water by killing micro-organisms. VA (volt-ampere) A unit of measurement for the product of voltage and amperage delivered to a device (VA=V*A). vanes (1) Stationary plates inside a duct used to control air flow. vanes (2) In building systems, vanes indicate whether an individual duct fitting contains turning vanes. Turning vanes are mounted into fittings to reduce pressure loss. To display the turning vanes in plan view, they must be added to the fittings style using the Add Vane command. vertex A vertex is a location where spline segments meet. It is also the location of the grip points in a spline. vertex X The X coordinate location of a pipe segment or component on an XY axis. vertex Y The Y coordinate location of a pipe segment or component on an XY axis. view A graphical representation of a model from a specific location in space. viewport A bounded area that displays some portion of the model space of a drawing. The TILEMODE system variable determines the type of viewport created. ■ When TILEMODE is off (0), viewports are objects that can be moved and resized. ■ When TILEMODE is on (1), the entire drawing area is divided into non-overlapping viewports. volt A unit of measurement for the amount of electromotive force that causes current to flow. voltage The number of volts present at a specific point in an electrical system. water filter A system that provides water purification. water hammer A pounding or knocking sound in water pipes, resulting from a sudden change in the pressure when a faucet is turned off. water hammer arrestor A piece that absorbs the extra pressure that causes water hammer in domestic use when the problem involves only a few fixtures. Glossary | 819