2024 Modern Airflow and Duct Design – LIVE

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Question 1 of 36

1. Question

What does ASHRAE stand for?

American Society of Helper, Refrigeration, Air-Conditioning Employees
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All-around Society of Heating, Refrigerant, Air-Conditioning Engineers
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American Society of Heating, Refrigerating, Air-Conditioning Engineers
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American Society of Heating, Refrigeration, Air-Conditioning Equipment
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Question 2 of 36

2. Question

A book covering Air Distribution for Residential and Small Commercial Buildings is the definition for what?

ACCA Manual T
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AACA Manual D
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ACCA Manual J
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ACCA Manual S
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Question 3 of 36

3. Question

Static Pressure is?

What your wife gives you
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The flow of air in the ductwork
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The pressure of the velocity in the system
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The resistance to airflow in ductwork or other components that creates an outward force of pressure in the duct system.
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Question 4 of 36

4. Question

AACA Manual D covers items related to __________________.

Residential Equipment Sizing
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Residential Load Calculations
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Residential Duct Design
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Air Distribution for Residential and Small Commercial Buildings
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Question 5 of 36

5. Question

What does CF stand for?

Correction Factor
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Cooling Feature
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Cooling Function
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Cooling Factor
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Cubic Feet
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Question 6 of 36

6. Question

What are the recommended velocities for a supply duct ran in flex according to Manual D?

700 – 900
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600 – 900
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600 – 700
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600 – 650
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Question 7 of 36

7. Question

What are the recommended velocities for a return branch in flex duct according to Manual D?

600 – 700
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600 – 600
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400 – 600
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400 – 700
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Question 8 of 36

8. Question

What are the recommended velocities for a return trunk in metal duct according to Manual D?

600 – 700
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600 – 600
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400 – 600
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400 – 700
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Question 9 of 36

9. Question

If a 10′ piece of duct is only stretched to 8′ 6″ what is the compression percentage?

30% Compression
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4% Compression
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No Compression
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10% Compression
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15% Compression
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Question 10 of 36

10. Question

What is the minimum span between hangers and allowable sag in flex duct?

4 feet and 2 inches
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4 feet and 1/2 inch
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5 feet and 1 inch
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5 feet and 1/2 inch
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Question 11 of 36

11. Question

Fan Performance depends on?

RPM
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CFM
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Filter
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Static Pressure
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Inlet Velocity
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Outlet Velocity
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Question 12 of 36

12. Question

What is the maximum available static pressure on an FB4C Fan Coil?

1.0 inches of W.C.
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.50 Inches of W.C.
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Depends on the fan speed selected
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.60 Inches of W.C.
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Question 13 of 36

13. Question

What is the manufacturers design static pressure for HVAC systems?

1.0 inches of W.C.
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.20 Inches of W.C.
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.50 Inches of W.C.
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.80 Inches of W.C.
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Question 14 of 36

14. Question

Are you really doing your job if you fail to measure static pressure every time you service a unit?

Yes
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No
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Question 15 of 36

15. Question

Should duct systems be sealed before you check static pressure?

Yes
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No, if you calculate the amount of leakage you have
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No one has time
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No
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Question 16 of 36

16. Question

You should measure static pressure at the ______ of your service call?

Beginning
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Middle
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End
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Question 17 of 36

17. Question

All supply registers are created equally across all manufactures? IE: same size = same performance

True
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False
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Question 18 of 36

18. Question

When testing a gas furnace for T.E.S.P, at what 2 points should you check?

After the filter and in the supply plenum before any takeoffs
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After the filter and before the coil
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In the return plenum and in the supply plenum
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Before the filter and before the coil
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Question 19 of 36

19. Question

When selecting your supply registers, you should consider the following?

Size of register
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Total CFM
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Face velocity
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Throw
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Pressure loss
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All of the above
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Question 20 of 36

20. Question

When designing a system for installation, it is important to know what filter is going to be installed?

True
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False
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It doesn't really matter as long as there is a filter installed
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The filter isn't critical to the system design
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Question 21 of 36

21. Question

It is important to “benchmark” every new system you install?

Yes
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No
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Question 22 of 36

22. Question

What are the methods used to check/verify airflow or CFM supplied by the furnace or fan coil?

Temp rise method
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Clock the gas meter
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Static pressure test
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Look at Product Data
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Look at operating status in the User Interface
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Question 23 of 36

23. Question

What is the correct formula for measuring airflow on a fan coil with resistant heat?

Volts x Amps x 3.414 / Delta T (temp rise) = CFM
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Volts x Amps x 3.414 / 1.08 x Delta T (temp rise) = CFM
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Volts x Amps x 3.414 / 1.08 / Delta T (temp rise) – 50 = CFM
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BTUH Output / 1.08 x Temp rise
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Look at operating status in the User Interface
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Question 24 of 36

24. Question

Volts x Amperes =

CFM
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BTUH
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Watts
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Capacitance
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Question 25 of 36

25. Question

1 Watt =

3.101 BTU's
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2.414 BTU's
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3.616 BTU's
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3.414 BTU's
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Question 26 of 36

26. Question

When getting your supply air temperatures for measuring airflow, it is best to take the measurement ____________?

In the supply plenum
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In the supply plenum directly above heat strips
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In the supply plenum and not in line of sight of the heat strips
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At 6 of the supply registers and average them together
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Question 27 of 36

27. Question

Use the formula below and select the correct answer for the airflow on this fan coil.

CFM = BTUH Output/(temp difference x 1.08)
1 Watt = 3.414 BTUs
Volts x Amps = Watts

Measured voltage is 242vac
Measured amps are 39
Supply temperature is 109°
Return temperature is 72°

1230 CFM

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1006 CFM

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750 CFM

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806 CFM

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Question 28 of 36

28. Question

What are 2 ways to verify the BTUH input on a gas furnace?

Clock the gas meter
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Look at data tag
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Measure manifold pressure
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Check the Product Data
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Question 29 of 36

29. Question

What is the correct formula for measuring airflow on a gas furnace?

BTUH Output / 1.08 x Temp rise
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Volts x Amps x 3.414 / 1.08 x Delta T (temp rise) = CFM
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BTUH Input / 1.08 x Temp rise
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Question 30 of 36

30. Question

Use the formula and select the correct answer for calculating airflow of a gas furnace.

CFM = BTUH Output/(temp difference x 1.08)
1 Watt = 3.414 BTUs
Volts x Amps = Watts

BTUH Input is 110,000
BTUH Output is 88,000
Supply temperature is 122°
Return temperature is 72°

1630 CFM

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1760 CFM

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1680 CFM

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1825 CFM

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Question 31 of 36

31. Question

The best methods to measure and determine the CFM produced by a package unit is to __________?

Look at the VFD
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Measure RPM's and refer to the Blower Table
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Check Static Pressures and refer to the Blower Table
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Look at the unit data tag
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Question 32 of 36

32. Question

When measuring static pressure it is critical the the positive + and negative – numbers get added or subtracted properly accordingly to the formula?

FALSE
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TRUE
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Question 33 of 36

33. Question

If you have a package unit with a belt driven blower, it is “OK” to install a larger blower sheave to get increased airflow?

In some cases yes, you have to consider the blower motor amps (old and new), static pressure (old and new) and the duct work capability
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NO, Never
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Yes, everything else will be fine
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You can only install a smaller blower sheave and never a larger one
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Question 34 of 36

34. Question

All duct taps are created equally and have no effect on the system performance in regards to airflow delivery?

TRUE
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FALSE
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Question 35 of 36

35. Question

What year did FER (fan energy ratings) go into effect?

2019
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2018
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2020
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2021
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Question 36 of 36

36. Question

PSC motors are still being used in new furnaces being manufactured today?

TRUE
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FALSE
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2024 Modern Airflow and Duct Design – LIVE

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