Sheet Metal Workers Local 17 J. , Dorchester, MA 02124. Sheet metal workers are part of the buildings and construction trade. When working in our union shops they layout. As time goes on, some things stay the same in the Sheet Metal trade, but other things change. Check out the latest happenings at the Local 17 training center. Register for classes today with Local 17! We offer the following classes. Please click for more information. First Aid and CPR and A.

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