Guidance on the Control of Odour and Noise from ... - Defra

Glossary of Terms
Access door A door providing access for maintenance or inspection purposes.
Air borne sound Sound transmitted through the air rather than through the structure of a
building or the ground.
Air conditioning A form of air treatment whereby temperature, humidity, ventilation, and
air cleanliness are all controlled within limits determined by the
requirements of the air-conditioned space.
Air diffuser A supply air terminal device usually placed in the ceiling and generally
of circular, square or rectangular shape composed of divergent
deflecting parts.
Air filter A mechanical device for removing particulate contaminants from an air
stream.
Air handling unit The assembly of air treatment equipment within one casing. It may
include filters, fans, humidifier, cooler battery and associated controls.
Balancing The process of adjusting the rates of air flow to achieve specified
values.
Carbon filter An air cleaning device, normally using activated carbon for removing
gaseous chemicals.
Cassette unit A type of split packaged air conditioning unit in which the internal unit is
mounted in the ceiling (recessed into the ceiling void).
Coil A heat-exchanging battery made of tubing formed into a compact shape
by spiral or serpentine configuration.
Damper A blade or set of blades that can be moved within a duct in order to
control air flow rate.
Detergent A cleansing agent, which may be solvent or water based, for removing
dirt.
Dirt Dry dust and debris
Dirt traps Those parts of the system prone to heavy dirt accumulation.
Disinfection A process to reduce micro-organisms to an acceptable level.
Duct An enclosure of any cross-sectional shape, but generally circular or
rectangular, through which air can flow.
Ductwork A system of ducts for distribution or extraction of air.
Electrostatic
precipitator
A device for removing particulate matter using electrical charge.
Exhaust hood or A hood associated with an extract system into which contaminated air
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