Comercial Air Filters And Sound Control

Question 1

Where do you put canvas connections on exhaust fans ?

Answer 1

Both sides

Question 2

What should not be used in kitchen exhaust ducts or with airstreams conveying solids or corrosive gases ?

Answer 2

Ductbliner ( installation)

Question 3

When velocity exceeds 4000 rpm what must be used for insulated duct ?

Answer 3

Insulation caps

Question 4

In a building what is the primary noise source ?

Answer 4

Mechanical equitment

Question 5

How many microns in one meter ?

Answer 5

One million

Question 6

What do drift eliminators do ?

Answer 6

Can be installed to help control humidity problems

Question 7

What are some options to attain proper noise reduction ?

Answer 7

Silencers
Fan isolation mounts
Interim bases
Fkexiabke connectors
acoustical liners and special sound traps

Question 8

List four types of isolator options available for centrifugal fans

Answer 8

Free standing
Restrained spring
Housed spring
Rubber in shear and neoprene mounts

Question 9

Are springs colour coded if so why

Answer 9

Yes to indicate the load capacity

Question 10

What material is used on the interior of a silencer ?

Answer 10

Acoustic insulation and perforated metal

Question 11

Where are flexiabke duct connectors used ?

Answer 11

Between machinery and ductwork

Question 12

Can duct liners be used for a kitchen exhaust system ?

Answer 12

No

Question 13

What is the amount of adhesive coverage required when installing duct liner ?

Answer 13

100% coverage

Question 14

When is metal nosing used on a duct liner

Answer 14

When velocity exceeds 4000 fpm

Question 15

What is the function of internal duct liner ?

Answer 15

For sound attenuation

Question 16

When should filters be changed ?

Answer 16

When the resistance to airflow has increased to two times the original recommended replacment by the manufacturer

Question 17

Are viscous impingement filters coated, if they are what is the coating ?

Answer 17

Yes with oily spray

Question 18

What does the acronym merv stand for ?

Answer 18

Minimum efficiency reporting value

Question 19

What is the name of the gauge used to measure the pressure differential across filters ?

Answer 19

The magnehelic gauge

Question 20

Which type of filter is used for odours and gaseous contaminants ?

Answer 20

Activated carbon filters

Question 21

Name two types of air washers ?

Answer 21

Spray type and cell type

Question 22

Name two types of air washers ?

Answer 22

Spray type and cell type

Question 23

Name two stages of an electronic air cleaner ?

Answer 23

Charging section
Collecting section

Question 24

Which stage of an electronic air cleaner uses ionizing wires with positive charge ?

Answer 24

Charging section

Question 25

What are two common methods of filter efficiency testing ?

Answer 25

Duct spot test Weight test

Question 26

An earthly matter smaller than 100 microns would describe

Answer 26

Dust

Question 27

Filtering media of fiber screen wire mesh expanded metal stamping or plates coated with an oily substance would best describe ?

Answer 27

Viscous impingement filter

Question 28

To be classified as a high efficiency filter a dry media filter must have a dust spot efficiency greater than ?

Answer 28

40%

Question 29

A two stage precipitator is another name for a

Answer 29

Electronic air cleaner

Question 30

The viscous impingement filter uses ______ effect to force the rapidly moving contaminant particles to strike the filter media

Answer 30

Centrifugal

Question 31

The _____tes and the dust spot test are two methods of measuring dust concentration before and after the filter

Answer 31

Weight

Question 32

Spray type air washers should never be installed on the suction side of the fan unless they have been built for this purpose (True or false )

Answer 32

False

Question 33

The more efficient type of air washer is ?

Answer 33

Cell type

Question 34

The direct transmission of sound from one opening to another through ductwork itself would define ?

Answer 34

Cross talk

Question 35

To improve arrestance some filters are coated with an adhesive this type of filter should be referred to as

Answer 35

A viscous impingement filter must

Question 36

To prevent the vibration from a floor mounted fan from being transferred to the floor you could use

Answer 36

Rubber mounts

Question 37

Allergy particles from weeds trees flowers and other forms of vegetation would describe ?

Answer 37

Pollen

Question 38

Dry media air filters are most efficient at

Answer 38

Low air filtration velocity’s

Question 39

Noise attenuation is important

Answer 39

On both sides of the duct system

Question 40

Merv ratings are based on ?

Answer 40

Ashare std. 52.2