definition
strict definition
machine roomless elevator
One or more gearless traction elevators where the lift mechanism fits entirely within the hoistway.
A machine roomless elevator is a gearless traction elevator with a technologically advanced design permitting the entire lift mechanism (including the sheave) to fit within the elevator shaft or hoistway. Because this eliminates the need for an elevator penthouse on an extra floor level, it reduces construction costs, saves space, and can improve architectural flexibility by permitting a flat roof.
This feature can be assigned to a built object when at least one machine roomless elevator is present. It does not mean that all elevators within the structure have to be machine roomless, although that often is the case.
The defining arrangement places the lift mechanism within the shaft or hoistway of the gearless traction elevator. It is the machinery arrangement, rather than a particular roof shape, that identifies this feature; at least one such elevator is sufficient for the building to have it.
Related definitions
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automated storage retrieval system
Storage space where goods are shelved and retrieved by robots to enable high capacity. -
automatic de-icing
Mechanical systems which melt or remove ice and snow from a structure's surface. -
automatic window openers
Installed mechanisms which ease control of windows by opening them automatically. -
bird control
Any system or device installed to prevent birds from roosting or entering a structure or area. -
building maintenance unit
A mechanism which crawls over a building carrying humans or machines to clean or maintain the surface. -
central air conditioning
A system that cools multiple rooms through supply and return air ducts connected to central cooling equipment. -
cooling ceilings
Ceilings with chilled-water pipes or coils that absorb room heat, usually supplementing air conditioning. -
direct digital control
A computerized control system for the heating, cooling, and ventilation components of a structure. -
dock leveler
A permanently installed movable ramp that facilitates freight transport between levels in a loading area. -
elevator destination control
A programmed system that increases elevator efficiency by allowing passengers to choose their locations before boarding. -
floodlights on approach area
High powered illumination directed over an entrance area, access route, or loading dock. -
forklift charging station
A designated site for recharging the batteries of electrically powered forklift trucks. -
freight elevator(s)
Elevators with above-average cabin and lifting capacity, designated for moving furniture and goods between floors. -
guideway transport system
An installed network of guideways used for internal delivery and distribution. -
high-voltage connection
A direct cable connection supplying at least 1,000 volts from an alternating-current electrical grid. -
inclined elevator
An elevator that follows a path departing from a straight vertical line, whether diagonal or curved. -
indoor cranes
Industrial cranes inside an enclosed structure, using a boom and hoist to lift heavy objects. -
openable windows
Windows that move between a sealed position and an open position admitting outside air, excluding doors. -
parking guidance system
An automatic electronic system that gives drivers updated information and directions to available parking spaces. -
passenger elevator(s)
Elevators are available for the vertical transportation of tenants or regular users of the structure. -
radome
An enclosure that protects microwave transmission equipment while allowing radio signals to pass through. -
raised floors
A floor raised above the structural floor plate to create space for cables, wiring, and utility pipes. -
reception antenna
A metal coil or other device, usually on a roof, for picking up airborne broadcast signals. -
robotic facade maintenance
A mechanical system that uses robots or automatic machines to clean and maintain a building's facade. -
robotic parking system
A mechanical system that guides or moves cars into and out of parking spaces within a parking area. -
rooftop water tank
A large container on a building's roof for supplying water to its plumbing or fire protection system. -
satellite dish
A concave disc mounted on or near an object to relay microwave signals to or from satellites. -
smoke exhaust system
Ducts or other outlets designed to carry smoke or cooking fumes out of a building. -
snow retention system
A system on a roof designed to prevent large blocks of snow or ice from falling to the ground. -
structured cabling
Internal telecommunications cabling meeting Category 5, 5e, or 6 standards and fitted with modular sockets. -
transmission mast
A high rooftop or building-top mast carrying an antenna that broadcasts communication signals. -
tuned mass damper
A stabilizing device designed to move in a contrary direction when a structure sways. -
uninterrupted power supply
Facilities for ensuring continued power in the case of a blackout in the normal supply. -
working pit
A sunken work area positioned beneath a vehicle to provide access to its underside for maintenance or repair.