| 摘要 |
The present invention relates to a supply and exhaust duct to lower a height. The supply and exhaust duct comprises: an exhaust cross connector having a bottom surface narrow pipe unit, a connection pipe unit, and a bottom surface expansion pipe unit; a supply cross connector having an upper surface narrow pipe unit, a connection pipe unit, and an upper surface expansion pipe unit; and a connection duct having an upper locking protrusion and a lower locking protrusion. The present invention can significantly lower overall height of an apartment housing and prevents, in advance, contamination of an inner space such as introduction of foreign substances. |
