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When supply air units are served outside air (OA) via a common intake duct:(Required)

"OA" may actually flow backwards

OA may vary depending on what other connected units are doing

Design OA may not be achievable

All of the above

What is the best practice to achieve an accurate and reliable OA flow?(Required)

Be sure to install the largest OA ductwork space will permit

Install only small ductwork for small airflow quantities

Install a dedicated duct run/roof penetration per supply air unit

Install a booster fan in each duct run

Which of the following are problematic for supply air units ducted directly to a dedicated outside air supply (DOAS)? (Choose all that apply)(Required)

Supply units often have short duct runs from the DOAS that must be traversed (unsuitable for traverse)

Proportioning each duct run from the DOAS is difficult and time consuming

Connecting the DOAS ducts directly to a supply air unit makes sure fresh air gets evenly distributed to the spaces

All supply air units need to run simultaneously at design speeds for a prolonged period

Which of the following is a better alternative to distributing fresh air to spaces? (Choose all that apply)(Required)

Duct fresh air from the DOAS into the spaces via ceiling diffusers

Stub fresh air ducts above ceilings near the return intake of small supply units

Stub one large duct from the DOAS into the ceiling space and let the air “gravity feed” thru transfer grilles

Let fresh air in through open windows to save energy in lieu of installing DOAS units.

Which of the following are common problems with opposed blade face dampers as the only means of adjustment for grilles?(Required)

Air velocity noise and whistling can occur if closed too far

If pressure is high enough, the dampers may slam shut if closed more than 50%

Some grilles with the largest airflow/air pressure may need to be completely closed and still be above design airflow, thus not pushing airflow where needed

All of the above

What are some common items we must test and/or get data on that are completely enclosed within a unit? (Choose all that apply)(Required)

Fan motor nameplate amperage rating (seldom found in submittal data)

Fan and motor speed

Fan speed adjustment

External static pressures

What actions would expedite project completion and assure a more efficient and accurate TAB experience regarding the above mentioned test items?(Required)

Selection of units with the needs of the startup technician, balancer, and end user in mind

Put all essential data in the submittals, especially motor nameplate ratings, and/or put rated amperage on the unit name tag

Ensure that speed controls for fans be mounted outside the unit and be easily accessible

All of the above

As technology continues to advance: (Choose all that apply)(Required)

Systems get much easier to work on

Air balancers are becoming unnecessary

Systems become more complex and are a challenge to everyone involved in the process

Care should be taken in the design and selection of units so they are simple enough that everyone from installers to the end users can work with them effectively as intended

To record accurate test measurements and make the correct adjustments, it is IMPERATIVE that balancers:(Required)

Be able to establish a static operating condition on units

Be able to manipulate controls to lock dampers, fan speeds, and valve positions to design conditions

Not have to spend excessive time figuring out complex sequences and control override codes

All of the above

When designing a system to circulate water through the chillers and the building loop, it is best to:(Required)

Have one pump on a drive and one pump circulating through a bypass valve

Save money by installing only one pump to circulate to both chiller and building loop

Install a primary/secondary pump system so both building and chillers have their own controlled flows

None of the above

AABC TAB Talk July 2026 – Difficult Designs: Systems That Make TAB a Challenge Quiz

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