air velocity at work area
air velocity at work place
Air Leakage Rate of Air Preheater
air to air heat recovery unit
air to air missile launching envelope
arctic air [= arctic air mass]
continental air [= continental air mass]
main air port exhaust air
marine air [= marine air mass
variable air volume (VAV) air conditioning system
variable air volume air conditioning system
integrated technique of indoor work and field work
integration of Indoor work and field work
work system of work safety
1# 10000 m3 air separation unit