Encyclopedia
Air duct
Duct - a closed channel along its perimeter, intended for moving air or an air mixture with impurities due to pressure difference at the ends of the channel (GOST 22270-76)
Source: "ORGANIZATION OF VENTILATION AT RADIATION OBJECTS. METHODICAL GUIDELINES. MU 2.2.8/2.6.1.67-02"
(approved by the Ministry of Atomic Energy of the Russian Federation on October 8, 2002, and by the Ministry of Health of the Russian Federation on November 16, 2002)