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The Case of the Foggy Office

Chuck Adams, TBE, Air Solutions, Inc.

1. How did the technicians solve the issue of negative pressure in the middle room?(Required)

Increased the speed of exhaust fans in the outer two rooms.

Adjusted the rooftop unit and supply outlets.

Installed additional exhaust fans in the middle room.

Reduced the airflow values for the exhaust fans

The Case of the Foggy Office

Chuck Adams, TBE, Air Solutions, Inc.

2. What was the problem with the location of the humidifier in the unit?(Required)

It was not connected to the unit's control system.

It was not installed after the unit was operating.

The discharge temperature sensor was not properly positioned.

The humidifier was oversized for the airflow going through it.

Coming Late into a Lab Exhaust Fans Balancing Project

Scott Demchuk, TBT, Precision Air Balance Company, Inc.

3. What was the primary challenge faced by the technicians when balancing the laboratory exhaust fans as desired by the engineer and customer?(Required)

Varying exhaust grille heights.

Accessing heavy metal panels.

Misplaced main dampers.

Lack of proper measuring instruments.

Coming Late into a Lab Exhaust Fans Balancing Project

Scott Demchuk, TBT, Precision Air Balance Company, Inc.

4. Which tool proved to be the right one for measuring the velocity of the different length grilles in this project?(Required)

Flow hood.

Smartphone app.

Rotating vane anemometer.

Duct traverse device.

Testing Dual-Path AHUs & Underfloor Systems

George Teasdale, PE, TBE, Engineered Air Balance Co., Inc.

5. Where was the chilled water coil located in the dual-path AHU?(Required)

In the entrance of the underfloor system.

In the overhead fan system.

At the entrance of the recirculation system.

Deeper in the hydronic system.

Testing Dual-Path AHUs & Underfloor Systems

George Teasdale, PE, TBE, Engineered Air Balance Co., Inc.

6. What method was used to determine the airflow through the transfer damper from the overhead supply fan to the underfloor fan system?(Required)

Pitot tube traverses.

Flow hood readings.

Temperature analysis of underfloor supply airflow.

monitoring fan speed.

HVAC Ventilation System Filtration Upgrades

Keith Suzuki, TBE, American Air Balance Company, Inc.

7. What does the National Emergency Management Institute recommend upgrading HVAC filtration systems to?(Required)

MERV-2 or Greater.

MERV-4 or Greater.

MERV-8 or Greater.

MERV-13 or Greater.

HVAC Ventilation System Filtration Upgrades

Keith Suzuki, TBE, American Air Balance Company, Inc.

8. How often should the recommended filter be replaced?(Required)

Same recommended preventative maintenance cycle as current filters.

Twice as often as the current recommended preventative maintenance cycle.

Bi-weekly.

Every 3 months.

Axial Gap Variations and Forward-Curve Fan Performance

William K. Thomas, Jr., TBE, Thomas-Young Associates, Inc.

9. What impact did the axial gap issue have on the performance of the fan systems?(Required)

Increased airflow and static pressure.

Improved conversion of dynamic pressure into static pressure.

Partial loading of fan blades, resulting in poor performance and lower airflow.

Axial Gap Variations and Forward-Curve Fan Performance

William K. Thomas, Jr., TBE, Thomas-Young Associates, Inc.

10. How did the article describe the solution to the axial gap issue in the fan systems?(Required)

Increasing fan RPM by 10%.

Adjusting the discharge and suction static on the fan.

Installing a plastic cone to cover the axial gap.

Pro-rating and balancing the system at the lower CFM.

2023 Fall TAB Journal Quiz

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