Page 21 - directory final 2014/2015

Access Control Systems - Elevators

A
AAMA – Architectural Aluminum Manufacturer’s Association.
ABOVE-GRADE – The portion of a building that is above ground level.
ACRE - 43,560 square feet.
A/C CIRCUIT - (Alternating Current) The flow of current through a conductor first in one direction then in reverse. It is used
exclusively in residential and commercial wiring because it provides greater flexibility in voltage selection and simplicity of
equipment design.
ACCELERATOR - Any material added to stucco, concrete, or liquid joint sealant which speeds up the natural set.
ADHESION – The property of a coating or sealant to bond to the surface to which it is applied.
ADHESIVE FAILURE – Loss of bond of a coating or sealant from the surface to which it is applied.
AGGREGATE - Crushed stone, slag or water-worn gravel that comes in a wide range of sizes that is used to surface built-up
roofs.
AIR DUCT – Ducts, usually made of sheet metal, that carry cooled air to all rooms.
AIR INFILTRATION – The amount of air leaking in and out of a building through cracks in walls, windows and doors.
20 AIR FILTERS - Adhesive filters made of metal or various fibers that are coated with adhesive liquid to which the particles of
lint and dust adhere. These filters will remove as much as 90% of the dirt if they do not become clogged. The more common
filters are of the throwaway or disposable type.

Chamber of Construction Industry Sri Lanka See page 24

Product & Material Suppliers