Elastic air duct

摘要

A flexible ventilation duct is formed of rigid segments in rectangular form that consist of outer wall of receiver (1) and inner wall of receiver (2) connected to the wall of joint (3), locks (4) arranged on the outer wall of the receiver (1), restrictors (5) arranged on joint wall (5) and in which at above and at beneath distance between the outer (1) and the inner (2) wall of receiver is equal to thickness of the joint wall (3) , and at the right and at the left distance between the outer (1) and the inner (2) wall of receiver is larger than thickness of joint wall (3) and at the right and at the left distance between the outer and the inner wall of receiver is equal to thickness of joint wall (3) or at above and at beneath and at the right and at the left distance between the outer (1) and the inner (2) wall of receiver is larger than thickness of joint wall (3).