| 摘要 |
A ventilation channel comprises inner segment of ventilation channel and outer segment of ventilation channel. Inner segment is L-shaped or E-shaped. At above and at beneath of the inner segment lugs are placed. The lower lug is tightening shoulder. The lugs are arranged with possibility of arrangement of fixation slot on tightening shoulder and fixation slot on the wall of the inner segment. Outer segment has rounded shape and at above and at beneath of the outer segment tightening shoulder is arranged. For connection of segments fixation lug is provided on the wall of the outer segment and fixation lug on tightening shoulder. Inner segment and outer segment are made of same material or of combination of materials selected from expanded polystyrene, polyethylene, polypropylene, polyurethane. |
