Install the braces as shown above. Simply put them in place, the proper width apart
(Dimension C). Drill through the duct work and your newly made ‘L’ pieces and pop rivet
or screw them into place. You will need four pieces, two each on the top and bottom.
Slide the heat exchanger carefully into the plenum to check the fit again. If all looks
good, you can seal off the ends of the heat exchanger and the hole you made in the
plenum with foil tape made for ductwork. Input lines should be at the bottom, unless
otherwise marked.
Installing a Heat Exchanger that is Longer than the Plenum
You can install a heat exchanger in a plenum that is smaller than the length of the heat
exchanger, as follows. Cut the lines at the top and bottom of the plenum, usually 4
inches long (the width of the heat exchanger).
Cut another line vertically, between the other two cuts, right in the middle as shown.
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