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 Facilities Glossary

As our industry changes we are constantly encountering new terms and concepts. We add them here to help you stay current on industry lingo. If you encounter a new term that does not appear here, please Contact Us so that we can research and add it.


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Terms Beginning with 'D'

D-CAFM

"Dead CAFM" Unfunderfunding and out of steam initiatives that have died due to lack of interest by new management. ...
 7.22.03



Dalton

A unit of molecular mass, 1.66 x 10-24 grams. One Dalton is equivalent to the mass of one hydrogen atom....
 4.19.05



Dance Floor

A lab configuration whereby large or fixed devices such as fume hoods, sinks, dishwashers, columns, and refrigerators are located along the perimeter, creating a spacious "dance floor" in the middle. Benchtops and other furniture that may occupy this open...
 10.3.03



Data

A digital representation of facts, concepts, and instructions....
 7.27.01



Data Mart

A database, or collection of databases, designed to help managers make strategic decisions about their business. Whereas a data warehouse combines databases across an entire enterprise, data marts are usually smaller and focus on a particular subject or d...
 7.21.04



Data Warehouse

A collection of data designed to support management decision making. Data warehouses contain a wide variety of data that present a coherent picture of business conditions at a single point in time. Development of a data warehouse includes development o...
 7.21.04



Daylight Control

A lighting-control strategy in which a photocell is used with a dimming system to provide a fixed light level at the workplace by increasing the amount of electric light with decreasing daylight levels and vice versa. See also Daylighting....
 3.21.07



Daylighting

To be effective, daylighting does not simply provide daylight. Daylight must be properly directed into interior spaces, and the intensity and quantity must be controlled. What is true of artificial light is also true of daylighting: a unit of light coming...
 4.2.08



DDC

See Direct Digital Control. ...
 4.19.05



Dead Loads

Non-moving loads, such as mechanical equipment, air conditioning units and the deck or floor itself....
 4.20.05



Debt Financing

In university environments, the use of bond issues, mortgages or other loan arrangements to fund capital projects. Most facility-related debt results from bond issues. From the university's standpoint, the main justification for debt financing a resea...
 4.20.05



Debug

Used in the computer field, the term means to eliminate errors and malfunctions from a computer program. The term was coined when an early room-size IBM computer malfunctioned because a moth had gotten inside the unit....
 4.20.05



Decibels

From Deci- (10), and bel (after Alexander Graham Bell). A measure of power gain or loss in a sound wave relative to an arbitrarily chosen power level. Equal to ten times the logarithm of the ratio between output power and baselevel power. A difference ...
 4.20.05



Deck

The structural surface to which the roofing or waterproofing system (including insulation) is applied....
 4.20.05



Declination

The angle of a heavenly body north or south of the celestial equator. Declination of the sun varies 23° from summer to winter. ...
 4.20.05



Decontamination

Removal of harmful substances such as noxious chemicals, harmful bacteria or other organisms, or radioactive material from exposed individuals, rooms and furnishings in buildings or the exterior environment....
 4.20.05



Dedicated Lines

Leased telecommunications circuits that are devoted to a specific application such as a teleconference network connecting fixed locations....
 4.20.05



Deep-Well Injection

Disposal of liquid wastes by pumping it into deep wells where it is contained in the surrounding geologic formation....
 4.20.05



Deformation of Block Copolymers

Uniaxial stretching of block copolymers shows that the alignment of the molecules actually changes during deformation. ...
 8.7.03



Deionization

The process of removing the charged constituents or ionizable salts from solution. A water purification process that uses synthetic resins to accomplish the selective exchange of hydrogen or hydroxyl ions for the ionized impurities in the water....
 4.4.05



Deliverables

Items (documents, drawings, models, material samples, etc.) prepared by an offeror in response to a Request for Proposal (RFP)....
 9.26.03



Delta

An increment, usually very small, that is symbolized by the Greek letter for D (Δ). From calculus where the sum of a function, f(x), over an interval can be approximated by dividing the interval into very small pieces (Dx), solving the function for e...
 4.20.05



Deluge Fire Sprinklers

Open heads attached to a dry pipe sprinkler system. When activated by smoke or heat sensor devices, a valve opens to provide a dense, uniform coverage of water over the protected area....
 4.20.05



Demand Side Management

Planning, implementation, and evaluation of utility-sponsored programs to influence the amount or timing of customers' energy use. (copyright California Energy Commission, glossary of energy terms)...
 4.2.08



Deploy

To install, test and implement a computer system or application. The term can be used to refer to any installation and testing, such as setting up a new network in an enterprise, to installing a server farm, to implementing a new application over a distri...
 8.25.04



Design Creep

The cumulative budget effect of changes and upgrades to a project. ...
 4.20.05



Design Development

The second of an architect's basic services. The architect prepares drawings and documents to describe the size and character of the entire project (structural, electrical, mechanical, materials)....
 1.22.04



Design-Bid-Build

The owner of the building provides legal assurance to the contractor that the design is free of error. Change orders are allowed when the designs are incorrect or incomplete. See Design-Build....
 9.26.03



Design-Build

Construction collaboration by the designer with the contractor where the design and construction processes overlap. ...
 4.20.05



Desktop Video-Conferencing System

The utilization of software, camera, and digital phone lines to communicate images and voice through video and audio compression on a personal computer. Contrast with Custom- or Site-Built Video Conferencing Room Systems and Group or Rollabout Video Confe...
 7.27.01



Dial-In/Dial-Out Bridge

A device that interconnects multiple telephone lines. Participants dial the bridge number (dial-in) or the bridge operator dials (dial-out) to bring them online. See also Bridge, Meet-Me Bridge, Operator-Assisted Bridge, and Telephone Conference Brid...
 7.27.01



Diffuser

In lighting, a device commonly put on the bottom or sides of a luminary to redirect or spread the light from a source. In HVAC, a device used to disperse air flow as it enters a room. Especially important in animal-holding rooms....
 4.20.05



Digital

In the context of smart buildings, pulses of electricity or light that can be transmitted as binary code at very high speed over wire or optical fiber. ...
 4.20.05



Digital Transmission Services (DTS)

A broad designation for a high-speed telecommunications service platform. ...
 1.29.04



Direct Digital Control (DDC)

An energy management system using the digital output signals of a control computer to directly adjust the position of HVAC valves and dampers without the use of intermediate pneumatic or electromechanical devices such as a receiver-controller....
 4.20.05



Directional Transmitting

In lighting, a property of certain glazing materials that changes the direction of transmitted light via refraction. For example, light-directing glass block employs prisms on the two faces for directional control. Directional transmitting is used to ...
 4.20.05



Disconfiguration

The breaking up of efficient groupings of workers or work areas as the result of building constraints such as floor plan, column spacing, service areas and fixed utility systems....
 4.20.05



Discount Rate

Following the principle that the value of money received (or money paid) is dependent on when it is received (or paid), the discount rate is the annual interest rate, compounded annually, used to determine the present value of money to be received (or...
 4.20.05



Discretionary Productivity

The extra performance that workers give when they are motivated to do their best work. Motivating factors include a clear relationship between one's task and the recognition received for it, meaningful work, money, the right tools and work environment...
 4.21.05



Disinfectant

A chemical agent that kills most pathogens but may not be effective against some viruses or spore-forming microorganisms....
 4.19.07



Disintermediation

In capital markets, disintermediation refers to the practice by investors of shifting their investments away from intermediate financial institutions, such as banks and savings institutions, to direct investments at a higher rate of interest in the se...
 4.21.05



Displacement Air Building

A structure that supplies fresh air from the floor and allows the heating from devices and people to naturally circulate the air in the spaces. Air is removed high, not supplied high, as in conventional buildings. Operational costs are significantly lower...
 5.1.06



Displacement Ventilation (DV)

The supply of ventilation air into the space either under the floor or at low level air outlets. Exhaust air is removed at a high level or a ceiling plenum. Common in laboratory animal room ventilation designs....
 7.22.03



Disposable Clothing

Disposable clothing is often used in cleanrooms, animal care, and hazardous operations. This clothing consists of jumpsuits, lab coats, hats, masks, gloves, gauntlets, shoecovers, aprons, and gaiters. While worn over a person's street clothes to protect t...
 7.22.03



Dissolved Inorganics

A water contaminant that includes calcium and magnesium ions dissolved from rock formations, gases that ionize in water, silicates leached from sandy river beds or glass containers, ferric and ferrous ions from rusty iron pipes, chloride and fluoride ...
 4.21.05



Dissolved Organics

A water contaminant that may include pesticides, herbicides, gasoline and decayed plant and animal tissues. Dissolved organics also include the plasticizers leached out of plumbing lines, styrene monomers from fiberglass-reinforced storage tanks, deio...
 4.21.05



Distillation

The act of purifying liquids through boiling, so that the steam condenses to a pure liquid and the pollutants remain in a concentrated residue. See also Reverse Osmosis....
 4.21.05



Distillation Hood

A type of laboratory fume hood that provides a work surface approximately 18 inches above the room floor to accommodate tall apparatus....
 9.5.06



Distribution List

A file on an electronic mail system that contains a list of names. The file is often accessible to many users, and addressing a message to the distribution list will generate a copy for every person on the list....
 4.21.05



Diurnal

Refers to day/night. Frequently used in reference to day/night control of lighting in animal rooms. Diurnal animals are active during the daylight and inactive at night. See also Nocturnal....
 7.25.01



Door Protection

In animal facilities, the coatings and devices used to protect the door from damage by equipment; e.g., epoxy, fiberglass, railing, kick-plates, etc....
 7.21.05



DOP-Smoke Penetration Test

A DOP-smoke penetration test is used for HEPA filters rated above 98 percent efficiency on an atmospheric-dust-spot test. The name comes from the gas dioctyl phthalate (DOP), which is used to perform the test. However, DOP use was widely discontinued seve...
 10.15.04



Dopant

An impurity which, when added to a pure semiconductor changes its electrical properties. Arsenic, for instance, is a common dopant for silicon. ...
 3.10.03



Down-Draft Table

A Local Exhaust Ventilation device. A blower is used to pull contaminated air away from the worker through slots in or near the table top work area. Commonly used in laboratory animal research facilities for control of anesthesia fumes....
 6.29.05



Downstream Processing

The stages of a biotechnology process that take place after the fermentation or bioconversion stage. Downstream processing includes separation, purification and packaging of the product....
 4.21.05



Dress In - Dress Out

Areas that have the entry and exit requirements of putting on and removing protective clothing. Such requirements are meant to keep contaminants from entering and hazardous agents from leaving the area. An area can also be just dress-in or just dress-ou...
 1.22.04



Drop Seal

A gasket for the bottom of doors to areas that require vermin and air pressure control, e.g. vivariums. When the door is closed the gasket is in the dropped position on the floor. When the door opens it raises up to allow clear passage for the door swing...
 1.22.04



Drosophila

Any of various small fruit flies of the genus Drosophila, especially D. melanogaster, used extensively in genetic research....
 2.27.06



Dry Lab

A laboratory where research is conducted using computers or other equipment, but not chemicals, sinks, etc. as would be found in a Wet Lab....
 12.12.03



DTS

Digital Transmission Services....
 4.21.05



Dual Duct

An HVAC system in which both heated and cooled air are simultaneously supplied to the work area in separate ducts, and temperature control of the area is achieved by varying the mix of hot and cold air at a constant air volume. The system provides con...
 4.21.05



Duct

A passageway or conduit made of sheet metal or other suitable material used for conveying air or gas at low pressures....
 4.21.05



Dump Cabinet

A specially designed hood used for the dumping of contaminated materials such as bedding or feces. It allows control and collection of particulate released during dumping....
 4.21.05



Dumping

The introduction of more makeup air than required in a room. Often caused by hoods exhausting more conditioned air than required....
 1.22.04



Dunk Tank

A tank containing chemicals used to disinfect or sterilize equipment, tools, or anything that will tolerate immersion in a liquid. Such tanks are also used to contain pesticide for the dipping treatment of animals for parasites....
 12.12.03



Duplex Audio

An audio teleconferencing system which allows all sites to be heard simultaneously rather than only one party. See also Full Duplex....
 7.25.01



Dust Collector

A Local Exhaust Ventilation device. Used to collect dust from small sites such as bedding dispensers and their surrounding area in laboratory animal facilties....
 9.26.03



DV

See Displacement Ventilation...
 7.22.03



Dynamic Joint

A joint intended to accommodate expansion and contraction movements of the structure. Also called an expansion joint....
 4.21.05



Dynamic Lighting

Lighting that automatically and continually changes during the day to balance natural and artificial lighting. Optical detectors can be used to shut down the perimeter zone of lighting when there is sufficient light coming through the windows, or when the...
 9.28.05



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