Comercial Kitchen Exhaust Systems

Question 1

Commercial kitchen exhaust systems must include which of the following components?

A canopy or hood
A duct system
Grease removal devices
All of the above

Answer 1

All of the above

Question 2

Island canopy hoods must overhang the equitment they ventilate by at least ______?

Answer 2

6” on all sides

Question 3

All seams and joints on commercial kitchen exhaust canopies must be ?

Answer 3

Welded fully and liquid tight

Question 4

______________ must be used for any part of the kitchen exhaust system exposed within a food service establishment?

Answer 4

Stainless steel

Question 5

Duct systems for commercial kitchen exhaust systems may be constructed with?

Answer 5

18ga stainless steel
16ga mild steel

Question 6

How many mechanical duct connections are you allowed in a commercial kitchen exhaust system?

Answer 6

As many as necessary

Question 7

When can a kitchen exhaust duct pass through a fire wall or partition?

Answer 7

Never

Question 8

If a building is less than four stories in height the enclosure around the kitchen exhaust must have a fire rating of no less than ?

Answer 8

One hour

Question 9

If a building is four stories in height or more the enclosure around the kitchen exhaust duct must have a fire rating of no less than ?

Answer 9

Two hours

Question 10

What must the clearance from unprotected combustible material in kitchen exhaust ducts be ?

Answer 10

18”

Question 11

Access doors provided on kitchen exhaust ducts must be ?

Answer 11

At each change in direction
On the sides or top of ducts

Question 12

How far must kitchen exhaust duct system outlets terminate from adjacent buildings ,air intakes or property lines?

Answer 12

10 feet

Question 13

What is the discharge clearance from the exhaust outlet to the roof surface ?

Answer 13

40”

Question 14

It is advisable to have two discharge ducts from a kitchen exhaust canopy when the length of canopy exceeds

Answer 14

10 feet

Question 15

The distance between the grease filter or grease removal device and the cooking surface of gas or electrically heated char broiler should be a minimum of ?

Answer 15

4 feet

Question 16

What is the minimum angle that grease filters should be installed from the horizontal ?

Answer 16

45 degrees

Question 17

When are engineer designed kitchen exhaust systems required by code for all new buildings ?

Answer 17

Only if the building is more than three stories in height

Only if the building has a combined kitchen and dining area of more than 3200 sq ft

Question 18

Which code adopts the latest edition of the national building code and makes changes to suit the needs of Albertans ?

Answer 18

ABC 2006

Question 19

What does a properly designed kitchen exhaust system promote ?

Answer 19

Promotes safe and better working conditions for all of thoese involved

Question 20

3 purposes of kitchen exhaust systems?

Answer 20

Reduce the potential of fire hazards

contain and capture grease laden cooking vapours

Exhaust them out doors

Question 21

7 basic equitment and components used for commercial kitchen exhaust systems ?

Answer 21

Hood or canopy
Intergal grease filtration
Fire suppression system
Duct system
Exhaust fan
Make up air unit
Control interlock device

Question 22

What is present in the effluent that is captured by a kitchen hood ?

Answer 22

Grease particles
Grease vapours
Heat
Odours
Moisture
Volatile organic compounds

Question 23

What are the two types of hoods ?

Answer 23

Type 1
Type 2

Question 24

What are type 1 hoods designed for ?

Answer 24

Handle heat and grease laden effluent and include a number of integrated filtration components and fire suppression components within the hood

Question 25

Type 1 hoods are constructed to withstand a fire situation. (True or false ?)

Answer 25

True

Question 26

Two categories of type 1 hoods ?

Answer 26

Standard Listed

Question 27

Diffrence between type 1 standard hoods and type 1 listed hoods ?

Answer 27

Listed is ULC labeled

Question 28

What hood would be used for a dishwasher ?

Answer 28

Type 2 hood

Question 29

What are type 2 hoods used and not used for ?

Answer 29

Used in the collection of steam vapour low heat and odours Not used for collecting grease or high heated vapours

Question 30

2 basic styles of type 2 hoods?

Answer 30

Canopy Non canopy

Question 31

4 types of canopy hoods ?

Answer 31

Island Wall Corner Slot

Question 32

Canopy hoods are usually fabricated by manufacturers? True or false

Answer 32

False they are often field fabricated

Question 33

How many sides exposed on island canopy?

Answer 33

Four

Question 34

How many sides exposed on a wall canopy?

Answer 34

3

Question 35

How many sides exposed on a corner canopy?

Answer 35

2

Question 36

Why might u not use a slot canopy type two hood ?

Answer 36

Complex to fabricate and meet required standards Larger maintenance times to wash the canopy and filters Maintenance is much more difficult

Question 37

Benefits of a slot canopy hood?

Answer 37

Linear slot around perimeter to collect the effluents Can capture contain and exhaust effluents with lower cfm than a regular canopy

Question 38

A slot canopy hood would be used in place of a large canopy hood. True or false ?

Answer 38

True

Question 39

What is another term for an eyebrow hood ?

Answer 39

Non canopy hood

Question 40

Two basic styles of non canopy hoods?

Answer 40

Backshelf (Passover ) Eyebrow

Question 41

Non canopy hoods are field fabricated ? True or false

Answer 41

False, thier pre fabricated hoods and should be sized according to manufacturer specs

Question 42

What hood is designed to be installed over oven type equipment ?

Answer 42

Eyebrow hood

Question 43

What hood is designed to exhaust effluents from the front of equipment ?

Answer 43

Eyebrow hood

Question 44

The back shelf hood (Passover hood) is designed to be installed closer to the cooking area. True or false ?

Answer 44

True

Question 45

What hood is normally set back from the front edge of the cooking surface ?

Answer 45

Backshelf hood (Passover hood)

Question 46

What are grease removal systems used for ?

Answer 46

Reduce the amount of combustible matter in the exhaust air

Question 47

4 types of grease removal systems ?

Answer 47

Filters Baffles Air washers Ultraviolet technology

Question 48

There must be a method of collecting the concentrated greased with drip trays where it can be later discarded. True or false

Answer 48

True

Question 49

All grease removable systems are to be fabricated and installed to meet what ?

Answer 49

NFPA ABC manufactures instructions Authority having jurisdiction

Question 50

What type of hoods have fire suppression systems ?

Answer 50

Type 1

Question 51

What must be integrated into a grease removal device that does not have a ulc rateing ?

Answer 51

Must be protected by an automatic ULC listed fire suppression system

Question 52

The means of containing the exhaust air until it leaves the structure could be referred to as ?

Answer 52

Exhaust duct system

Question 53

Any duct can be used to exhaust air from a kitchen. True or false ?

Answer 53

False, only approved or ulc labeled duct can be installed

Question 54

Exhaust fans and motors shall be ulc/csa approved and rated for continuous operation ? True or false ?

Answer 54

True

Question 55

What minimum air velocities through the duct must be maintained according to the NFPA 96 2010 edition ?

Answer 55

500fpm or 152.4m/min.

Question 56

What do counter interlock panel systems do ?

Answer 56

Ensure that make up air is supplied when the kitchen exhaust fan is turned on as well to ensure that the exhaust fans are turned on when mua is supplied

Question 57

What do control interlock panel systems prevent and ensure ?

Answer 57

Prevents kitchen fumes from entering the dinning area as well as ensures satisfactory venting of other gas appliance’s

Question 58

Kitchen exhaust canopies need to be designed and constructed in accordance with ?

Answer 58

ABC NFPA-96 local codes

Question 59

The overhead canopy type hood shall be sized to completely cover the equitment it is designed to ventilate plus an overhang of at least ___________ on all sides of equitment not mediate adjacent to walls or other construction extending above the cooking surface

Answer 59

6” (153mm)

Question 60

What conditions must be met to have extra mechanical joints in kitchen exhaust ductwork ?

Answer 60

Must be exposed and accessible

Question 61

Why do we try to route grease exhaust ducts vertically to the roof with minimal offsets and turns ?

Answer 61

Minimize pressure losses

Question 62

Can u use a butt weld connection in kitchen exhaust ducts ?

Answer 62

No

Question 63

Can u interconnect ductwork with any other ventilation systems in the building ?

Answer 63

No

Question 64

The distance between the grease remival device and the cooking surface shall be as great as possible but not less than ?

Answer 64

18” (457mm)

Question 65

Why are grease filters installed at an angle no less than 45 degrees ?

Answer 65

Because it’s code and helps the filters drip grease to the drain pan

Question 66

What removes grease from the air stream by means of centrifugal forces ?

Answer 66

Baffle filters

Question 67

What do u call the processes that breaks down grease molecules into water carbon dioxide and mineral acids ?

Answer 67

Photolytic oxidation

Question 68

Formula to calculate numbers of filters required ?

Answer 68

Total surface area required divided by Effective filter area

Question 69

When your number of filters required is a decimal number do you round up or down ?

Answer 69

Round up to the next whole number

Question 70

Where is the effective area of a filter found ?

Answer 70

Manufactures table

Question 71

4 items that are added together to create total ressistance of a system ?

Answer 71

Filter losses Hood losses Exit losses Duct losses

Question 72

3 types of exhaust fans

Answer 72

Impeller fans or inline fans Up blast fans Blower or utility fans

Question 73

Fans that move air with blades similar to airplane propellors?

Answer 73

Impeller fans or inline fans

Question 74

Most common fans along with blower fans and typically located in the interior duct and are used where extieror fan mounting is impractical ?

Answer 74

Impeller or inline fans

Question 75

Which fan uses centrifugal backward inclined fan wheels and are either direct drive or belt driven ?

Answer 75

Up blast fans

Question 76

Typically alluminum centrifugals that are designed for roof mounting directly on top of the exhaust van. Very common type of kitchen exhaust fans ?

Answer 76

Up blast fans

Question 77

Fans that offer a variety of discharge positions and are often called squirrel cage fans and are generally more efficient than impeller fans ?

Answer 77

Blower or utility fans

Question 78

Fans used typically where high static pressure losses exit ?

Answer 78

Blower or utility fans

Question 79

Normally roof mounted fans with the inlet and outlet 90 degrees from each other ?

Answer 79

Blower or utility fans

Question 80

Closed doors of either normally closed doors or a permante opening and the total free are of the opening does not exceed 16sq ft, the DFMAH shall be interlocked with a mechanical exhaust system and the proven airflow capacity of the interlocked exhaust system shall not to be less than _________% of make up air supply

Answer 80

90%

Question 81

Maximum distance from surface of cooking appliance to hood ?

Answer 81

4 feet

Question 82

Required fire rateing for an enclosure around a kitchen exhaust duct in a four story building ?

Answer 82

2 hours