Duct clamp for pulling together air duct connection profiles For connecting rectangular air duct systems Suitable for all profile sizes incl. screwed-in screw M8 x 25 mm Material thickness 3 mm Material: galvanised steel The duct clamp is placed over the air duct profiles and fastened with the screw. The profiles are pressed against each other by tightening the clamp. Duct clamps should be installed so that the free length between 2 connection points does not exceed 200 mm. The hexagon head screw must be tightened to approx. 7 Nm.