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Third Year > Comercial Air Filters And Sound Control > Flashcards

Comercial Air Filters And Sound Control Flashcards

1
Q

Where do you put canvas connections on exhaust fans ?

A

Both sides

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2
Q

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

A

Ductbliner ( installation)

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3
Q

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

A

Insulation caps

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4
Q

In a building what is the primary noise source ?

A

Mechanical equitment

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5
Q

How many microns in one meter ?

A

One million

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6
Q

What do drift eliminators do ?

A

Can be installed to help control humidity problems

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7
Q

What are some options to attain proper noise reduction ?

A

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

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8
Q

List four types of isolator options available for centrifugal fans

A

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

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9
Q

Are springs colour coded if so why

A

Yes to indicate the load capacity

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10
Q

What material is used on the interior of a silencer ?

A

Acoustic insulation and perforated metal

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11
Q

Where are flexiabke duct connectors used ?

A

Between machinery and ductwork

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12
Q

Can duct liners be used for a kitchen exhaust system ?

A

No

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13
Q

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

A

100% coverage

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14
Q

When is metal nosing used on a duct liner

A

When velocity exceeds 4000 fpm

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15
Q

What is the function of internal duct liner ?

A

For sound attenuation

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16
Q

When should filters be changed ?

A

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

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17
Q

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

A

Yes with oily spray

18
Q

What does the acronym merv stand for ?

A

Minimum efficiency reporting value

19
Q

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

A

The magnehelic gauge

20
Q

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

A

Activated carbon filters

21
Q

Name two types of air washers ?

A

Spray type and cell type

22
Q

Name two types of air washers ?

A

Spray type and cell type

23
Q

Name two stages of an electronic air cleaner ?

A

Charging section
Collecting section

24
Q

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

A

Charging section

25
Q

What are two common methods of filter efficiency testing ?

A

Duct spot test
Weight test

26
Q

An earthly matter smaller than 100 microns would describe

A

Dust

27
Q

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

A

Viscous impingement filter

28
Q

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

A

40%

29
Q

A two stage precipitator is another name for a

A

Electronic air cleaner

30
Q

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

A

Centrifugal

31
Q

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

A

Weight

32
Q

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 )

A

False

33
Q

The more efficient type of air washer is ?

A

Cell type

34
Q

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

A

Cross talk

35
Q

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

A

A viscous impingement filter must

36
Q

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

A

Rubber mounts

37
Q

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

A

Pollen

38
Q

Dry media air filters are most efficient at

A

Low air filtration velocity’s

39
Q

Noise attenuation is important

A

On both sides of the duct system

40
Q

Merv ratings are based on ?

A

Ashare std. 52.2

Third Year (10 decks)

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