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Are you an AABC, ACG, or EMA member? (check all that apply)(Required)

AABC

ACG

EMA

None of the above

Under-Floor/Above-Floor Combo Systems

Michael Agnew, AIR Engineering and Testing, Inc.

1. How many air handlings units did this project consist of?(Required)

Four AHUs per floor for three floors.

Three AHUs per floor for three floors.

Two AHUs per floor for four floors.

Five AHUs per floor for six floors.

Under-Floor/Above-Floor Combo Systems

Michael Agnew, AIR Engineering and Testing, Inc.

2. Because the AHUs all mirrored each other and the last zone ductwork was oversized, the damper was required to be:(Required)

Only 5 to 20 percent open.

Only 10 to 20 percent open.

Only 20 to 30 percent open.

Only 20 to 40 percent open.

Under-Floor/Above-Floor Combo Systems

Michael Agnew, AIR Engineering and Testing, Inc.

3. What was the reading taken with the fume hood from the 10 in. x 10 in. hole in the sheetrock?(Required)

150 CFM

200 CFM

650 CFM

954 CFM

Pre-TAB Project Review – Shelled Spaces

Terry Wright, TBE, Engineered Air Balance Co., Inc.

4. What are shelled spaces?(Required)

Spaces without façade installed (unpainted, fixture coverings not applied).

Areas designed for future occupancy but unoccupied during original project construction.

Areas left purposely unbalanced as doors and windows haven’t been installed.

Furnished areas in a building that have furniture installed but left unoccupied.

Pre-TAB Project Review – Shelled Spaces

Terry Wright, TBE, Engineered Air Balance Co., Inc.

5. What does the article mention is a common way to try to keep construction costs to a minimum?(Required)

Keeping terminal inlet velocities below 2,500 FPM.

Designing terminal units at or below their maximum inlet value.

Keeping dampers fully open.

Reducing outside air to zero.

Pre-TAB Project Review – Shelled Spaces

Terry Wright, TBE, Engineered Air Balance Co., Inc.

6. What was the fix employed by the owner at the end of the TAB agency’s involvement in the project?(Required)

Disable two of the AHU fans.

Set all dampers to open.

Run fans in reverse.

Manually cycle two fans every week.

Flow Safety Switch Locations

Chase Copeland, TBE, Engineered Air Balance Co., Inc.

7. Why is electric heating more beneficial than hydronic heating in Southern environments?(Required)

The humidity causes hydronic heating to cause condensation.

Hydronic systems are prone to leaking.

Less heating is needed throughout the year, so it is more cost-effective.

Electric heating can be repurposed for electric cooling.

Flow Safety Switch Locations

Chase Copeland, TBE, Engineered Air Balance Co., Inc.

8. On variable air volume terminal applications, where are sensing tubes initially installed?(Required)

.05 in. after the intake.

5 in before the intake.

On high-pressure side of the system, before the control damper.

On the low-pressure side of the system, after the control damper.

Flow Safety Switch Locations

Chase Copeland, TBE, Engineered Air Balance Co., Inc.

9. What solution did the TAB agency, manufacturer, and design engineer ultimately agree on?(Required)

Use differential pressure to verify airflow for the pressure switch by using the sensor tubes at the “T” flow cross.

Measure the readings at each unit and average the results.

Take readings on one unit while turning the others off.

Set unit to factory settings.

Tech Talk

• Can TAB Proceed Without Interior Doors Installed? • Industrial Exhaust Systems – Phased Construction & TAB

10. According to the AABC responses, do interior doors need to be installed before TAB can begin?(Required)

Yes, in all cases all doors must be installed prior to any TAB activities beginning.

No they do not, as long as they are installed before TAB is completed.

Yes, except in the case of pressurized systems.

No, interior doors are irrelevant to completion of TAB testing.

Tech Talk

• Can TAB Proceed Without Interior Doors Installed? • Industrial Exhaust Systems – Phased Construction & TAB

11. Regarding the question about the industrial exhaust system for a medical glove manufacturer in the Dallas-Fort Worth area: What capacity will the first phase of fan startup have the fan running at?(Required)

12%

19%

25%

50%

Engineering Issues: Rooftop Systems with Economizer and Barometric Relief Damper

Kevin Andrade, TBE, Raglen System Balance Inc.

12. According to the article, how does the TAB agency usually set the outside air?(Required)

With the power exhaust fan controlling room pressure.

By closing the damper at the outside air intake.

With the cooling tower fan.

By opening the damper at the outside air intake.

Engineering Issues: Rooftop Systems with Economizer and Barometric Relief Damper

Kevin Andrade, TBE, Raglen System Balance Inc.

13. What did the barometric relief damper require to push airflow out of it?(Required)

Positive pressure in the return plenum.

Negative pressure in the return plenum.

Decrease in air temperature inside the shell.

Water flushing of the vents.

Case Study: Airflow Measurement and Control with Induction Diffuser Technology

Todd Yates, PE, TBE, CxA, Synergy Test and Balance, Inc.

14. Why can’t a fume hood be used to measure airflow on active chilled beams?(Required)

It won’t be able to fit over the entirety of the beam.

The hood disrupts induction and the normal operation of chilled beam airflow.

The output generated by the hood will make the flow seem weaker than it normally is.

The electrical current needed for the hood’s operation will cause the fans to change and match pressure.

Case Study: Airflow Measurement and Control with Induction Diffuser Technology

Todd Yates, PE, TBE, CxA, Synergy Test and Balance, Inc.

15. What was the key piece of information that convinced everyone that the induction diffuser Cv calculations were the best method for determining new Cvs?(Required)

There was a misaligned vent coupling at the air intake.

The results from VAV-12 and VAV-13.

The results from VAV-9 and VAV-13.

The cooling beams leaked into the ventilation.

2023 Winter TAB Journal Quiz

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