ventilator

nouns

a device (such as a fan) that introduces fresh air or expels foul air
is derived from
is derived from
is derived from
is a part of
a mechanical system in a building that provides fresh air
"she was continually adjusting the ventilation"
is a type of (narrower)
an instrumentality invented for a particular purpose
"the device is small enough to wear on your wrist"; "a device intended to conserve water"
a device that facilitates breathing in cases of respiratory failure