Air Balancing

Question 1

What’s TAB stand for

Answer 1

Testing,adjusting, and balancing

Question 2

Hvac airflows and pressures meet the design of

Answer 2

Equipment manufacturer

Question 3

In some instances a variable motor can consume how much power annually

Answer 3

85 less then single speed

Question 4

What two measurements are in a pilot tube

Answer 4

Static pressure
Total pressure

Question 5

Inner tube of the pilot tube measure what

Answer 5

Total pressure

Question 6

Outter part of the pilot tube measure what

Answer 6

Static pressure

Question 7

A delimiter measure what kind of reading

Answer 7

FPM

Question 8

Velometer can be used where

Answer 8

Fume Hoods, grills, diffuser and slots on ventilation

Question 9

Velometer can only measure up to

Answer 9

10” wc

Question 10

Can a Velometer be used for gas mixture

Answer 10

No

Question 11

Two most basic anemometers are

Answer 11

Thermo
Rotating vane

Question 12

Thermal anemometers method is to measure air velocity by

Answer 12

Heat transfer from small wire immersed into the air

Question 13

Rotating vane anemometer measure in what

Answer 13

Linear foot or meters

Question 14

Barometers ( flow hoods) can measure to what value

Answer 14

0- 2000 CFM

Question 15

What’s
Ps
Pt
Pv

Answer 15

Static pressure
Total pressure
Velocity pressure

Question 16

Static pressure is best described

Answer 16

Potential energy

Question 17

Total pressure is best described

Answer 17

Sum of all energy

Question 18

How can velocity pressure be found

Answer 18

Velocity pressure minus static pressure

Question 19

What’s used to measure accurate airflow

Answer 19

Pilot tube

Question 20

Who much straight duct is needed before taking a measurement

Answer 20

6-10 duct diameters

Question 21

Pilot tube should always be pointed into the

Answer 21

Airflow

Question 22

What’s the minimum and maximum amount of reading to be done

Answer 22

12-64

Question 23

If there’s any insulation on the outside of the duct it need to be

Answer 23

Subtracted

Question 25

Round duct can use how many reading

Answer 25

Two readings

Question 26

Where should reading be in round duct

Answer 26

Vertical and horizontal not directly in the middle of pipe

Question 27

If flow hood cannot be used what other one can be used

Answer 27

Rotating vane

Question 28

Readings should be taken how far apart

Answer 28

Equal spacing four inch apart

Question 29

What’s AK factor mean

Answer 29

Area factor

Question 30

After measurements are done the diffuser can be

Answer 30

Marked and labeled at the diffuser

Question 31

Which ever method is used it must meet what

Answer 31

Specifications for testing , adjusting, and balancing

Question 32

Three things to make sure is done before balancing

Answer 32

Specifications and mechanical drawing Label grills on prints Startup has been completed

Question 33

Diffusers and grills and dampers should all be open before what

Answer 33

Balancing the system

Question 34

What should blower speed be set at to check system

Answer 34

High speed

Question 35

Total CFM must operate between 80 - 120 of its total design true or false

Answer 35

True