Commercial Kitchen Exhaust Systems

Question 1

Commercial kitchen exhaust systems must include which components?

Answer 1

A canopy or hood, a duct system, and grease removal devices

Question 2

Island canopy hoods must overhang the equipment 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

Liquid tight

Question 4

What 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

16 Ga mild steel or 18 Ga stainless 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 duct 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 be 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 of direction and on the sides or top of duct. They must never be on the bottom.

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 the canopy exceeds?

Answer 14

10 feet

Question 15

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

Answer 15

4 feet

Question 16

What is the minimal 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 and 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 is the purpose of a kitchen exhaust hood system?

Answer 19

To reduce the potential of fire hazards by capturing grease-laden cooking vapours and other products of the cooking process and contain them until the fan can exhaust them to a place outdoors where they are unobjectionable.

Question 20

What are the two major type categories which are used in the common commercial kitchen?

Answer 20

Type 1 ventilation hoods (standard and listed) and Type II ventilation hoods (canopy hoods and non-canopy hoods)

Question 21

What are the four sub-styles for canopy hoods?

Answer 21

Island canopy, wall canopy, corner canopy, and slot canopy

Question 22

What are the two basic styles of non-canopy hoods?

Answer 22

Backshelf and eyebrow

Question 23

Duct work shall extend a minimum of ___ above the roof?

Answer 23

18”

Question 24

The air velocity through any duct shall not be less than?

Answer 24

500 fpm or 152.4 min

Question 25

What will have the largest effect on hood performance?

Answer 25

The design of the MUA system

Question 26

In order to keep odours out of a dining area, pressure levels should not exceed?

Answer 26

Negative 0.02" water column (wc)

Question 27

What do control interlock-panel systems do?

Answer 27

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

Question 28

Grease drip trays shall have a capacity not exceeding?

Answer 28

1 US gallon (3.8l)

Question 29

The make-up air needs to be designed and installed in accordance with?

Answer 29

Alberta Building Codes and NFPA-96

Question 30

Direct fired make-up air heater system is not to supply more then ___ of the exhaust air.

Answer 30

10 percent

Question 31

What are grease filters used for?

Answer 31

To capture the highly combustible grease from the effluent and direct it to a collection system.

Question 32

What are the main types of grease filters?

Answer 32

The baffle filter, the water wash filter, and exhaust hoods with ultraviolet (UV) technology

Question 33

What is the use for UV technology?

Answer 33

It removes the remaining smaller grease particles that are not able to be extracted by centrifugal grease extractors. It does this with a process called photolytic oxidation which breaks down the grease molecules into water, carbon dioexide, and mineral acids.

Question 34

What is the optimum operating velocity range for the baffle type grease filter?

Answer 34

150 fpm to 300 fpm

Question 35

When elbows are used, a radius of ___ to ___ times the duct diameter is recommended.

Answer 35

2 to 2.5 times the duct diameter

Question 36

What are the three major types of exhaust fans?

Answer 36

Impeller fans or inline fans, up-blast fans and blower or utility fans

Question 37

What are the 3 steps when selecting a base make-up air unit?

Answer 37

Determine required tempering options, required supply airflow, and external static pressure

Question 38

What do listed Type 1 hoods carry in regards to certification?

Answer 38

ULC listing label

Question 39

How many sides of an island canopy are exposed to draw air in?

Answer 39

4 sides

Question 40

How many sides of an wall canopy are exposed to draw air in?

Answer 40

3 sides

Question 41

How many sides of an corner canopy are exposed to draw air in?

Answer 41

2 sides

Question 42

What would a slot canopy be used in place of?

Answer 42

A large canopy type hood

Question 43

What is the one advantage of using a slot canopy?

Answer 43

Can exhaust effluent at lower cfm

Question 44

What is the minimum distance from the bottom of a duct if an access door is to be installed on the side of an exhaust duct?

Answer 44

1 1\2"

Question 45

What is the minimum gauge duct systems for commercial kitchen exhaust systems may be constructed with?

Answer 45

16 ga mild steel

Question 46

What must be approved for kitchen exhausts?

Answer 46

ULC & CSA

Question 47

A commercial kitchen exhaust should be what pressure?

Answer 47

Under a slight negative pressure

Question 48

What is the main requirement for an exhaust fan with grease latent air?

Answer 48

Has to be approved for grease removable