Framing question: rec header height for 14' span?

Considering removing wall in the middle of room (see illustration)…
What is rec header height for load bearing wall for 14’ span?

(I’m guessing two 2x12s w 1/2" ply spacer?)
This is single story with truss roof/ attic above.

TY

image

I would not give any engineering advise and you should probably consult one. That said, the wall in the middle, if under a engineered truss may not be load bearing.

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Thanks and noted.
This forum is generally a first informational step…