I had a 10' addition added after a fire and the beam the (worthless) contractor installed is sagging. The city inspector said it needs to be replaced with something suitable.
From photos I have it looks like single 4x6 (not LVL) that angles with the roof.
I live in the midwest so it need to support snow load too.
The distance, inside the house, from peak to outside wall is 25' (7.6m) and the beam spans 19.5' (6m) wall-to-wall.