Vent Duct

The expansive sound of air expressed in this deep rumble reverberating through metal passageways can put even the most wild beast to sleep in an instant. These calming caverns of flowing air are like metallic monuments to the meditative sound of motion. Ducts are used in heating, ventilation, and air conditioning to deliver and remove air. Traditionally, air ductwork is made of sheet metal, but can be made from polyurethane, fiberglass, fabric, or flexible plastic. Ducts, especially in homes, must often allow air to travel vertically within relatively thin walls. These vertical ducts are called stacks and are formed with very wide and relatively thin rectangular sections or oval sections. Air ducts are one important method of ensuring acceptable indoor air quality as well as thermal comfort. This sound uses the following file from Freesound: http://freesound.org/samplesViewSingle.php?id=93059