Duct može da bude ventilacioni kanal – air/ventilation duct (pošto se ovde radi o Tech/Engineering - Construction / Civil Engineering):

„Ducts are used in heating, ventilation, and air conditioning (HVAC) to deliver and remove air. These needed airflows include, for example, supply air, return air, and exhaust air.[1] Ducts also deliver, most commonly as part of the supply air, ventilation air. As such, air ducts are one method of ensuring acceptable indoor air quality as well as thermal comfort.“
( http://en.wikipedia.org/wiki/Duct_(HVAC) )


U sistemima klimatizacije (HVAC), koriste se uređaji za ovlaživanje vazduha koji kroz dizne (nozzles) ubacuju vodenu paru u sistem razvoda vazduha, tj. u ventilacione kanale i taj mlaz bi trebalo da se ubacuje u pravcu ose kanala (strujanja vazduha), a ne na zid kanala. U katalogu Lechlera može sa naći sledeće:

„Pneumatic atomizing nozzles
…
Application
Humidification of air, cooling.“
( http://pdf.directindustry.com/pdf/lechler/pneumatic-nozzles/... )


Moguće je da se o tome radi, u svakom slučaju bilo bi korisno imati i širi kontekst.