1

2

6

air type

1

1

1

air velocity

4

1

1

Ak-value (effective area of an air terminal device)

1

4

1

anemometer

3

1

1

angle of a transformation piece

4

1

1

aspect ratio (of a rectangular air terminal device)

4

2

1

automatically controlled air terminal device

5

2

2

axial flow fan




4

2

2

baffle

1

2

8

balancing

3

2

2

bend (elbow)

5

2

2

bifurcated fan

5

1

1

blow-through unit

3

2

2

branch

1

2

1

bulging, caving of a duct or enclosure(s)

3

2

2

butt connection

4

2

2

butterfly dampers or valves

1

2

5

bypass factor


_cj

1

2

8

calibration

1

3

1

casing

5

2

2

casing of an air handling unit

5

2

2

centrifugal fan

1

3

5

chiller

5

2

2

circulating fan

1

2

1

clean room

3 '

1

1

clearance (for ductwork connection)

3

2

2

cleat

6

1

1

Clo-unit

3

2

2

collar

5

2

1

combined section of an air handling unit

6

1

1

comfort condition

1

2

8

commissioning

1

3

1

component

5

2

1

component of an air handling unit

3

2

1

component of ventilation or air conditioning

4

2

1

components of air diffusion

4

2

1

components of air distribution

3

2

2

connector

5

2

2

contra rotating fan

4

2

1

control device (air terminal unit)

1

2

1

control system

2

2

2

cooker hood

5

2

2

cooler

1

3

5

cooling

5

2

1

cooling coil

4

1

1

core area of a sand trap louvre

4

1

1

core area of an air terminal device

2

2

2

cowl

4

1

1

cross-sectional area of a duct


_Dj

4

2

1

damper and valve

5

1

1

damper control (of a fan)

5

2

1

damper section

3

1

1

deflection of a duct

3

1

1

deflection of a joint

1

2

1

dehumidification

1

1

1

deviation

1

1

1

dewpoint (temperature)

1

2

4

diffusion of air

1

3

5

direct fired air heater

4

1

1

discharge or entry loss coefficient of a louvre

1

2

4

displacement air diffusion

6

1

1

distance to the v m s'1 isovel

3

2

2

door and inspection panel

5

2

2

drain cock

5

2

2

drain plug or cock

6

1

1

draught

6

1

1

draught risk rating

4

1

1

drop (of an air jet in mixing air diffusion)

4

2

1

dual duct unit

3

2

1

duct board

3

2

1

duct connection component

3

2

1

duct fitting

3

1

2

duct sealing

3

1

2

duct support

3

1

1

duct support spacing

3

2

2

duct transformation

5

2

2

ducted fan

3

2

1

ductwork components

2

1

1

dwelling

1

1

1

dynamic pressure



4

1

1

effective area of an air terminal device

3

1

1

effective length of a duct

3

1

1

effective length of a fitting

4

2

1

element of distribution

3

1

1

equivalent diameter of a straight rectangular parallel duct

6

1

1

exfiltration

1

2

1

exhaust air

5

1

1

exhaust air classification

5

1

1

external fan pressure difference

6

1

1

external work

4

2

1

externally mounted air terminal device

2

2

2

externally mounted wall air terminal device

5

1

1

extract air

5

1

1

extract air classification

2

2

2

extract air terminal device

5

1

1

extract temperature differential



1

3

5

fan

2

1

1

fan assisted balanced ventilation

2

1

1

fan assisted exhaust ventilation

4

2

2

fan assisted induction terminal unit

4

2

2

fan assisted induction terminal unit with constant flow rate

4

2

2

fan assisted induction terminal unit with variable flow rate

2

1

1

fan assisted supply air ventilation

5

1

1

fan control methods

1

2

5

fan functions

5

2

2

fan inlet

1

2

5

fan installation categories

5

2

2

fan outlet

5

2

1

fan section of an air handling unit



1

2

5

fan types

3

2

2

female connector

1

3

1

filter

5

2

1

filter section of an air handling unit

1

2

1

filtration

4

2

2

fire and smoke damper

4

2

2

fire damper

4

2

1

fixed air terminal device

4

2

2

fixed directional grille

4

2

2

fixed non-directional grille

4

2

1

fixing accessory for air terminal devices

3

2

2

flange

5

2

1

flash chamber

3

2

1

flexible duct

6

1

1

floor temperature dissatisfaction risk

1

2

1

flow

4

2

2

flow equaliser

4

1

1

flow rate control device

1

3

4

flow rate controller

1

2

4

flow rate pressure characteristic

4

1

1

free area of an air terminal device

4

1

1

free area ratio

4

1

1

free area velocity

4

2

2

fully adjustable air diffuser

8

1

1

functional check

8

1

1

functional measurement




G I

1

2

2

grease absorption efficiency

4

2

1

grille




H I

1

3

1

heat exchanger

1

2

5

heat recovery

5

2

1

heat recovery section of an air conditioning unit

4

2

2

heat removal luminaire

1

1

1

heating

5

2

2

heating coil

6

1

1

height of the v m s'1 isovel (for displacement air diffusion)

4

2

2

hit and miss damper or valve

1

2

1

humidification

1

1

1

humidification efficiency

5

2

1

humidifier section of an air handling unit

1

1

1

humidity

1

1

1

hydraulic diameter

1

4

1

hygrometer




1 1

1

2

5

impeller tip diameter (of a fan)

6

1

1

indoor air

6

1

1

indoor air classification

6

1

1

indoor air classification on CO2 (non smoking areas)

6

1

1

indoor air classification on controlling

6

1

1

indoor air quality

4

1

1

induced air

4

1

1

induced air temperature

1

2

4

induction rate

4

2

2

induction supply air terminal device

4

2

2

induction terminal unit (excluding fan-powered terminal unit)

6

1

1

infiltration



3

1

1

insertion length

4

1

1

insertion loss (of a weather louver)

3

2

2

inspection panel

6.

1

1

insulation of clothing

1

2

1

internal heating load

4

1

1

internally induced air flow rate (air terminal device)

4

2

1

internally mounted air transfer device

4

2

2

iris damper and valve

4

1

1

isovel




J I

5

2

2

jet fan




L I

1

2

1

leakage

5

1

1

leakage of an installation

4

2

2

linear air diffuser

4

2

2

linear grille

6

1

1

local air velocity

1

2

6

local mean air velocity

1

2

6

local measured mean air velocity

4

2

1

louvre

4

2

2

low velocity air terminal device

3

1

1

lower limit (of a duct)




M I

3

2

2

male connection

1

4

1

manometer

4

2

2

manual damper

4

2

2

manual valve

4

2

2

manually adjusted air terminal device

1

1

1

mass flow rate

6

1

1

mean measured temperature of the occupied zone

6

1

1

mean radiant temperature

1

4

1

measurement station

4

2

2

mechanical constant flow rate controller

4

2

2

mechanical variable flow rate controller

6

1

1

met-unit

6

1

1

metabolic rate

5

1

1

mixed air

4

1

1

mixing air diffusion

5

2

1

mixing section of an air handling unit

1

3

1

mixing section of an air terminal unit

4

2

2

multiple leaf damper or valve




N I

1

2

1

natural ventilation

3

1

1

negative rated operating pressure

3

1

1

nominal length of a flexible duct

3

1

1

nominal length of a rigid duct

4

1

1

nominal size of an air terminal device

3

1

1

nominal size of duct and fitting

4

2

2

nozzle




0 I

1

2

1

occupied zone

6

1

1

odour dispersion time

6

1

1

odour reduction factor

6

1

1

operative temperature

6

1

1

optimum operative temperature

6

1

1

outdoor air

6

1

1

outdoor air classification