Concentric Exhaust System Installation

  1. Slide the crimped end of the 90º Elbow into the top collar of the Steam Hood.
    90 Degree Elbow Connected to Hood
  2. Connect the round, stainless steel extension to the top of your evaporator’s Base Stack (if applicable). Then connect the “T” to the top of that extension so that the drain of the “T” is pointing downward at the back of the evaporator. The purpose of the stainless steel extension is to elevate the “T” to the same height as the 90º Elbow from Step 1. (The photo below is showing the top of a Base Stack crowned with an extension and a “T” as described in this step. On the right side of that photo, you can see a Strap Stack connected to the “T”. That will actually be covered in a later step. Do not attach the Strap Stack yet.)
    Stainless Steel “T” on an Extension on a Base Stack
  3. Put one of the black gaskets around the horizontal hub of the 90º Elbow. Put the second black gasket around the horizontal hub of the “T”.
  4. Connect the 90º Elbow to the “T” using the Strap Stack. The seam of the Strap Stack should be pointing upward. Fasten using the provided bolts. Make sure the Strap Stack is overlapping the black gaskets to create a water-tight seal. (For future reference, if you ever want to lift your Hood up off your pan, you would simply need to remove this Strap Stack to do so.)
    Connecting the Strap Stack
  5. Connect your Smoke Stack Pipe on top of the “T”. This will be your inner pipe.
  6. Connect a set of Concentric Fins around the Smoke Stack Pipe like a belt. The fins should be used every four feet to keep the Smoke Stack Pipe centered within the Steam Stack Pipe.
  7. Connect your Steam Stack Pipe to the top of the “T” by sliding it over the top of the Smoke Stack Pipe and Fins. This is our outer pipe.
  8. Continue building the concentric pipes upward until they BOTH exit your roof. Being sure to use Concentric Fins approximately every four feet as described in step 6. WARNING: BOTH OF THE CONCENTRIC PIPES MUST CLEAR YOUR ROOFLINE IN ORDER TO BE COMPATIBLE WITH THE CLEARANCES NOTED IN THE SPEC SHEET. OTHERWISE THE OUTSIDE PIPE WOULD BE TOO HOT AND YOU WILL NEED TO INCREASE DISTANCE FROM COMBUSTIBLES JUST AS YOU WOULD FOR A REGULAR SMOKE STACK PIPE.
  9. To decrease the number of burning embers, extend the Steam Pipe about 6 feet higher than the Smoke Pipe (ABOVE THE ROOFLINE). This gives the embers opportunity to mix with the steam before exiting.
  10. Attach a hose to the drain on the “T”. This way you can direct any drain water to the location of your choice rather than letting it drip. (ie. Direct the hose into a bucket or a floor drain). Protect the hose by making sure that it never rests against the hot stack pipe/evaporator.