civil air defense basements
Civil air defense engineering
Civil Air Defense projects
Civil Air Defense Works
high-rise building civil air defense basement
Local astringents and local detergents
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