| 摘要 |
The invention relates to piping for transporting air or the like media, especially for use in heating, ventilation or air-conditioning systems, for example as electrical installation piping. The inventive piping has an inner height (Hi) of between approximately 30 and 80 mm and an inner width (Bi) of between approximately 70 to 150 mm, the inner height (Hi) being preferably not larger than approximately half the inner width (Bi). The piping has a substantially sinusoidally waved wall (W) having a wave height (Hw) of between approximately 4 and 10 mm and a wave length (Lw) of between approximately 5 and 20 mm. |
