Duravent vinyl siding standoff

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I think that is designed to be covered with the Square Horizontal Cap assembly, 58DVA-HC.
 
Cap assembly measurements cover inside square. I guess the other part remains exposed from what I am seeing on searches
 
Yes, cap goes on raised square (46DVA-HC or 58DVA-HC) and it will have an open tray around it, acting as a heat dissipater protecting the vinyl siding adjacent to the raised outside edging. Best always to have a gas tech install gas piping and venting. Stay warm.