Discussion Starter · #1 ·
The photo shows the top (output end of my new Trane 1 1/2 ton heat pump air handler. As you can see the opening is bigger on the sides than the fan output duct by about 3 to. 4 inches. I am going to build a plenum to connect to my round ductwork the size of the full cabinet opening but was wondering should I have it cover the side openings or should they be left as part of the plenum space?
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