Air distribution ducts used in air conditioning system

Rectangular: These are the most common ducts used in air conditioning systems and correspond to 85% to 90% of the existing ducts.

Giroval: of oval section constructed from the "flattening" of circular duct; these ducts are constructed from strips of plates and with spiral joints to the full extent, which gives it resistance and aesthetic appearance characteristic.

Flexible Duct: Flexible ducts are constructed with spiral
reinforced aluminum with external insulation by glass wool blanket and
coating.