CB
Built Like A Tank With Laser Precision
Page
16
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Measure the width of the heat exchanger (Dimension A in next diagram). Measure the
thickness of the heat exchanger (Dimension C).
Start by cutting a hole in the side of your ductwork the thickness of the heat exchanger
(Dimension C) and the full length of the ductwork (usually Dimension A).
WARNING! Metal edges are very sharp! Wear protective gloves and use caution!
Slide the heat exchanger into the hole for a test fit. Ideally the tubes (D and E) should stick out of
the plenum (see diagram above). The header and tubes (F) can stick out of the plenum as well, if
necessary. As long as the entire coil surface (B) is in the plenum, operation should be fine even if
the header (F and G) sticks out.
While test fitting try to determine how much tape is needed around the frame of the heat
exchanger to seal and keep air from flowing around it. A different amount (thickness) may be
needed on different sides. You can purchase different thicknesses of tape so that it will fit and
seal properly. Use enough foam tape so that it fits tight and air can’t blow by it.
The heat exchanger needs to be installed so it won’t move up or downstream in the plenum. The
easiest way is to fabricate some pieces of metal into andL’ shape, approx. the length of the heat
exchanger like shown above.