air distribution box - alluvial terrace
- air passage
- air passenger volume
- air pattern
- air pavement breaker
- air permeability
- air permeability apparatus
- air permeability factor
- air permeability fineness test
- air permeability method
- air permeability test
- air pick hammer
- air pipe
- air piping
- air placer
- air placing
- air placing machine
- air pocket
- air pollution
- air pollution control
- air pollution control system
- air port
- air power
- air preheater
- air pressure
- air pressure losses
- air pump
- air pump tube
- air purification
- air purifier
- air purity
- air quality monitoring station
- air quality standard
- air raid shelter
- air range
- air receiver
- air recirculation
- air reducer
- air refrigerating machine
- air register
- air regulating damper