N. air pipe, air tube, airhole, blowhole, breathinghole, venthole, shaft, flue, chimney, funnel, vent, nostril, nozzle, throat, weasand, trachea, bronchus, bronchia, larynx, tonsils, windpipe, spiracle, ventiduct, ventilator, louvre, jalousie, venetian blinds, blowpipe, pipe, jhilmil, smokestack, screen, window screen, artificial lung, iron lung, heart and lung machine, 3, imperfect fluids