Cost is obviously a key consideration when evaluating capital equipment for complex HVAC systems. Listed below are 10 reasons why Tri-Stack® systems help reduce costs for pollution abatement, odor control, and re-entrainment.

1. Modular construction

Tri-Stack® fume exhaust systems are composed of three individual modules, specially designed to speed and simplify installation while lowering installation cost. Modular design permits quick installation directly on the roof, eliminating the need for expensive construction equipment and helicopters that require building evacuation. Tri-Stack® systems (with self-contained mixing boxes or plenums) may be easily retrofitted onto existing roofs or roof ventilation systems with minimal effort.

2. Fast installation

A typical Tri-Stack® four fan exhaust system can be mounted on the roof – in less than two hours – with minimal rigging equipment. And when retrofitting existing ventilation fans and systems (typically installed while penthouses are being constructed), Tri-Stack® eliminates the need for “temporary” exhaust systems. In addition to substantially lower installation costs, engineering costs are also reduced, as well as disruption of work schedules which can cause wasteful and expensive downtime.

3. Reduced horsepower motors

A new exhaust nozzle design maximizes system performance to provide increased airflow and efficiency while lowering horsepower requirements, thus further reducing energy consumption.

4. No protective penthouses

Without maintenance problems, there’s no need for expensive penthouses to protect maintenance personnel on the roof under adverse conditions. Instead, you can expect savings of several hundreds of
thousands of dollars in a typical installation.

5. Maintenance-free operation

Tri-Stack’s® direct drive motors are virtually maintenance-free with typical lifetimes of 200,000 hours. There are no belts, pulleys, flex connectors, or spring vibration isolators to maintain, and the motors
are designed to operate continuously – without periodic maintenance – for years
under normal conditions.

6. Unique exhaust nozzle design

Tri-Stack® fume exhausters incorporate computer designed, state-of-the-art exhaust nozzle designs that help lower resistance, increase flow and pressure, and increase stack outlet velocities to minimize bypass requirements. These characteristics work together to further reduce operating costs.

7. Special fan wheel design

Tri-Stack’s® unique fan wheels are developed with Computer Aided Design (CAD) techniques. Efficient fan blade design helps lower horsepower requirements with subsequent energy reduction. In addition, non-stall characteristics permit use of variable frequency drives, further enhancing efficiency and reducing energy consumption.

8. No expensive silencers needed

Increased air flow vs. resistance efficiencies enable Tri-Stack® fume exhaust systems to provide high performance at substantially lower noise levels–particularly in the lower octave bands–often eliminating the need for expensive inlet and/or outlet silencers.

9. Simple installation without roof curbs

Stack height of Tri-Stack® systems is only about 60% of conventional roof stacks. Low profile design eliminates the need for spring isolation, inertia bases, flexible connections, guy wires (with associated pitch pocket roof leaks), or other expensive, time-consuming and maintenance intensive installation hardware and procedures.

10. 200,000 hour motor lifetimes

The direct drive motors in Tri-Stack® fume exhaust systems are designed to operate continuously for years under normal conditions;
typical lifetimes are 200,000 hours.