38 Assembly of ventilation ducts using Gebhardt joints How to make a Gebhardt joint • 4 Gebhardt sectional frames. • 4 sectional corners. • Insert 2 corners in each of the longest sectional frames. • Then attach both short sectional frames to one of the long sectional frames. • Finally, the rectangular frame is terminated by putting the last long sectional frame in place.
RkJQdWJsaXNoZXIy NzAwNg==