Crossword Genius

Air vent (4)

Ross

I believe the answer is:

duct

(Other definitions for duct that I've seen before include "Channel" , "Tube for conveing cable, liquid etc" , "Pipe, tube" , "Tube, passageway" , "The Eve of St - is a narrative poem by Keats" .)

I've seen this clue in the Penny Press.
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