Arrow loop. 2. in a fortification, one of a number of long, narrow slits in the walls, usually widening inward to permit small arms to be fired over a wide angle at an enemy. 3.
A device for extracting foul air from a compartment eg engine room, hold, etc and supplying fresh air to it
A devices that captures heating or cooling energy from stale indoor air and transfers it to fresh incoming air.
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A machine which pumps air into and out of the lungs of someone who has difficulty in breathing the newborn baby was put on a ventilator. also called respirator
The name of various machines contrived to expel the foul air from the store-rooms and hold, and introduce fresh in its stead.
