I am adding an alcove into a fire-rated 2x6 wall for a load center. I am looking for input on the construction of the alcove.
Front of Alcove
I believe it would be best to minimize air flow by building the alcove with 2x6 material (which is wider than the 3.25” load center) that would isolate the space behind the load center from the rest of the stud cavity. See diagram below.
Rear view - 2x6 construction
Otherwise I could build the alcove with 2x4 and allow air flow between the stud cavity behind the load center. See diagram below.
Rear view - 2x4 construction