Purpose of Wall Thimble Framing

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FrankRade

New Member
Sep 19, 2020
15
kentucky
I have a Supervent 6" Wall Thimble to install. Can somebody explain to me the purpose / function of framing in the wall thimble. From what I have read, I can't just anchor the thimble to the drywall. Thanks.
 
It needs to be framed in for both support and to guarantee proper clearances.
 
Figured as much. Curious why though if the screw holes in the exterior plate span the stud width. I guess they dont always align perfectly?