1, galvanized spiral duct horizontal installation, diameter or long side size is less than or equal to 400mm, spacing should not be greater than 4m; greater than 400mm, should not be greater than 3m. Spiral galvanized spiral duct support, hanger spacing can be extended to 5m and 3.75m; for thin steel plate flange galvanized spiral duct, its support, hanger spacing should not be greater than 3m.

2, galvanized spiral duct vertical installation, the spacing should not be greater than 4m, a single straight pipe should have at least two fixed points.

3, galvanized spiral duct support, hanger should be set according to the National Standard Atlas and specifications to select the strength and stiffness to adapt to the form and specifications. For the diameter or side length greater than 2500mm wide, overweight and other special galvanized spiral duct support, hanger should be designed.

4, support, hanger should not be set in the outlet, valves, inspection doors and automatic control agencies, from the outlet or plug the distance should not be less than 200mm.

5, when the horizontal suspension of the main, dry galvanized spiral duct length of more than 20m, should be set to prevent the swing of the fixed point, each system should not be less than one.

6, hanger screw hole should be used mechanical processing. The boom should be straight, thread complete, smooth. After installation of the branch, the hanger of the force should be uniform, no significant deformation. Galvanized spiral duct or air conditioning equipment used to adjust the vibration, hanger stretching or compression should be adjusted according to the design requirements.

7, hoop bracket, angle should be straight, hoop should be close and tighten tight galvanized spiral duct. The circular galvanized spiral ducts mounted on the bracket shall be provided with brackets and hoops, and the arcs shall be uniform and consistent with the outer diameter of the galvanized spiral ducts.