This is a common misconception. In reality the “Tri” in Tri-Stack is in reference to Strobic Air’s time tested Tri-Plume nozzle technology that adds entrained volume to both the interior and exterior of the plume before exiting the wind band. The primary benefit of this is to feed extra volume to Strobic Air’s patented converging plume nozzle to add additional momentum to the plume allowing for greater stack heights. The wind band also has the added benefit of allowing the plume to exit the nozzle unaffected by cross winds, allowing it to develop the proper plume profile.

Strobic Air fan systems can function in many different ways. We can provide systems as basic as constant volume and as dynamic as fully controlled. The Strobic Air S.A.F.E. Controller allows for the modulating of the fan speed and dampers to truly tailor the exhaust system to the building’s real-time demand.

Strobic Air has been the standard in the High Plume exhaust market for nearly 30 years. The technology has been proven in thousands of applications to not only meet and/or exceed the same stack height requirements as tall stacks, but also incorporate the additional benefit of higher dilution. The added benefit of the higher dilution means lower energy cost per CFM of diluted air, as well as removing the requirements for costly guy wires/ pitch pockets, vibration isolation curbs, and flexible connectors. See below for an example performed by an independent testing agency, which displays the Computational Fluid Dynamics (CFD) Results showing dilution of a standard tall stack (top image) versus the Tri-Stack solution (bottom image). In the upper figure, the “Raised” tall stack is nearly three time higher in height that the Tri-Stack in the lower figure.

The first is the profile of the air leaving the fan blades. In the centrifugal example below it shows the turbulent characteristics of the flow leaving the fan. In this application once the air exits the nozzle it maintains this rotational “tumbling” characteristic that forces the air out of a straight line profile. With the mixed flow impeller that the Tri-Stack employs you see more of an axial characteristic. In this case the air maintains a laminar flow in the correct direction of the plume. We also employ the use of straightening vanes directly after discharge of the impeller that eliminates any rotational momentum of the air. These additional benefits build the proper plume characteristics required to maximize plume height while eliminating the need for additional energy wasting accessories (tall stacks, etc.)

In most applications the standard coating is capable of resisting most acids. In the more extreme cases Strobic Air has several options for different types of construction (Stainless Steel) and/or specialty coatings. Strobic Air has over 50 years of experience in handling special applications. If you have a caustic air that you need to exhaust then Strobic Air is your solution.

The primary benefit is reliability. The standard L-10 bearing life of direct drive fans is 3 times longer than the belt driven equivalent. Every Tri-Stack exhaust fan that Strobic sells is rated for an L-10 equivalent of over 17 years. That means fewer failures and less downtime of processes or test.

Strobic Air’s fans are balanced to 0.5 mils, 0.0127 millimeters, peak to peak. This is over 5 times better than the industry standard. The benefit of this is standard spring isolators are not required to isolate the transmission of vibration into the supporting structure. This eliminates the need for expensive springs, flex connectors, and guy wires.

Unlike your typical centrifugal exhaust fans that require bi-weekly or monthly maintenance. The Tri-Stack exhaust fans only require maintenance every 18 months, each fan simply needs to be greased. Another added benefit is the fans can continue to run, unlike your typical centrifugal systems, while the maintenance is performed and comes equipped with grease release valves to ensure the unit is never over-greased