500kV lightning arrester
aluminium cell lightning arrester
autovalve lightning arrester
carbon lightning arrester
comb lightning arrester
compounding lightning arrester
line lightning arrester
zinc oxide lightning arrester
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
expansion -coefficient of thermal expansion
1# 10000 m3 air separation unit