Combined ventilation pipe

The utility model provides a combined ventilation pipe. The combined ventilation pipe comprises a pipe body and flanges, the pipe body comprises four side plates and four corner beads, the four side plates define a square cylinder, and every two adjacent side plates are connected through one corner bead; two inserting grooves are formed in the angle bead, and the side plates can be inserted into the inserting grooves; the flange is in a square ring shape, the flange is arranged at the end of the pipe body in a sleeved mode, and the flange and the pipe body are fixed in a separable mode. By the adoption of the technical scheme, the combined ventilation pipe can be stored and transported in the form of plates and can be combined and assembled on a construction site, the assembly structure is very simple, and splicing and combination operation is convenient. 本实用新型提供了一种组合式通风管，包括管体以及法兰；所述管体包括四个侧板以及四个角条，四个所述侧板围成方筒形，相邻的两个侧板之间通过一个所述角条连接；所述角条上设置有两个插槽，所述侧板能够插入所述插槽内；所述法兰为方形环状，法兰套在管体的端部并且与管体可分离地相固定。采用上述技术方案，本实用新型的组合式通风管，