There are specific welded plates spaced along some lintels particularly those at the very ends, so cutting off a 30mm or so does mean losing strength at these points.
I guess if you were to cut a lintel all the way back to the next weld then it won't make a difference.
its a standard, we have now slighty changed the window opening in size so that it does not have to be cut down.
We have over 300mm load bearing on each end.
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