GB 50243-2016 第4.3.7条
| **** | **Duct supports and hangers**: Spacing of duct supports and hangers in hotels: for horizontal installation, ≤4 m when side length ≤400 mm, and ≤3 m when side length >400 mm; for vertical installation, spacing ≤4 m, with at least 2 fixings per riser. |