Greenheck Fan 47555 Riser Installation, Plenum Assembly, Lab Exhaust Riser, Plenum Isometric View

Riser Installation

Check curb or structural supports for levelness. Both must be level to ensure proper drainage from plenum and fan(s).

Lab Exhaust Riser

Riser duct(s) run up through the curb and are flanged over the curb. (by contractor)

Roof Curb—anchor curb to roof deck structure in accordance with project construction documents and local codes.

Plenum Isometric View

For side inlet fans, remove panel at end of plenum. This opening is the designed connection spot for user connected ductwork from building.

Plenum Assembly

Note: Gasketing material (shipped with fan) should be placed on the top edge of already installed roof curb prior to placing the plenum or individual plenum sections on the curb.

If the plenum is shipped disassembled, the plenum sections can be assembled together into one single piece before lifting onto the roof and then fitted on the roof curb / support structure, or each section can be placed on individually. The method used would be dependent on the lifting capacity for the equipment on-site. If moving each piece separately onto the roof curb or support structure, each section should be joined to its mating part before moving another section into place.

For a 1x1 system there is only a single plenum section and no multiple plenum assembly would be required.

Determine the placement of the plenum sections relative to each other (Multiple Fan Systems)

When looking at the individual section one will notice that each plenum section is missing at least one side panel. These areas are the locations where the sections are to be joined together. If you have two plenum sections, then each one would be missing a side panel. If you have a three-fan system, there are three plenum sections. The two end plenum sections would each be missing one side panel and the middle section would not have panels on two sides. Please refer to the submittal drawing for the orientation of any Bypass Air Plenum (BAP) dampers or air inlet locations.

Putting the plenum together

After identifying the plenum sections arrangement order, one of the two mating sections has weld nuts on the inside of the plenum. The assembly hardware (stainless steel bolts) required to join the sections is located here for shipping purposes. These bolts should be removed and set-aside prior to placing the mating sections together. The bolts are located every 6 to 10 inches to provide the best seal between the mating sections.

Before moving the sections into position, gasketing must be installed to seal the plenum sections against leakage. This silicone gasketing is supplied with the fans and only needs to be applied to one of the two mating plenum sections. The bands or strips of gasketing should be attached around the perimeter of the joining face and with an additional strip making a triangular area in each corner.

After the gasketing has been attached and the hardware has been removed, place the two mating sections together. The stainless steel bolts, which were set aside earlier, are now run first through the holes of the plenum section without the weld nuts and tighten into the weld nuts on the other plenum section.

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Vektor-CD Centrifugal Laboratory Exhaust