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Collar to join two 4 x 10 heat registers

last month

Seems so simple but haven't yet found! I want to mount a 4 x 10 heat register on a wall and have the same immediately opposite on the other side of the wall. Total wall thickness is 4-1/2 inches [3-1/2 inches for the 2x4 stud plus 1/2 inch drywall on both sides]. I would think there is such a thing as a collar or coupler to join together two standard heat registers.

The purpose is to allow heat from heated room into the unheated room.

Can anyone direct me to where I might buy such a product?

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