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Commercial and Industrial HVAC > Commercial Kitchen Exhaust Systems > Flashcards

Commercial Kitchen Exhaust Systems Flashcards

1
Q

Commercial kitchen exhaust systems must include which components?

A

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

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2
Q

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

A

6” on all sides

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3
Q

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

A

Liquid tight

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4
Q

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

A

Stainless steel

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5
Q

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

A

16 Ga mild steel or 18 Ga stainless steel

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6
Q

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

A

As many as necessary

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7
Q

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

A

Never

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8
Q

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?

A

One hour

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9
Q

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?

A

Two hours

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10
Q

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

A

18”

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11
Q

Access doors provided on kitchen exhaust ducts must be?

A

At each change of direction and on the sides or top of duct. They must never be on the bottom.

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12
Q

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

A

10 feet

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13
Q

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

A

40”

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14
Q

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

A

10 feet

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15
Q

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?

A

4 feet

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16
Q

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

A

45 degrees

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17
Q

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

A

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

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18
Q

Which code adopts the latest edition of the National Building Code and makes changes to suit the needs of Albertans?

A

ABC 2006

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19
Q

What is the purpose of a kitchen exhaust hood system?

A

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.

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20
Q

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

A

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

21
Q

What are the four sub-styles for canopy hoods?

A

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

22
Q

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

A

Backshelf and eyebrow

23
Q

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

A

18”

24
Q

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

A

500 fpm or 152.4 min

25
Q

What will have the largest effect on hood performance?

A

The design of the MUA system

26
Q

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

A

Negative 0.02” water column (wc)

27
Q

What do control interlock-panel systems do?

A

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.

28
Q

Grease drip trays shall have a capacity not exceeding?

A

1 US gallon (3.8l)

29
Q

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

A

Alberta Building Codes and NFPA-96

30
Q

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

A

10 percent

31
Q

What are grease filters used for?

A

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

32
Q

What are the main types of grease filters?

A

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

33
Q

What is the use for UV technology?

A

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.

34
Q

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

A

150 fpm to 300 fpm

35
Q

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

A

2 to 2.5 times the duct diameter

36
Q

What are the three major types of exhaust fans?

A

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

37
Q

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

A

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

38
Q

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

A

ULC listing label

39
Q

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

A

4 sides

40
Q

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

A

3 sides

41
Q

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

A

2 sides

42
Q

What would a slot canopy be used in place of?

A

A large canopy type hood

43
Q

What is the one advantage of using a slot canopy?

A

Can exhaust effluent at lower cfm

44
Q

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?

A

1 1\2”

45
Q

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

A

16 ga mild steel

46
Q

What must be approved for kitchen exhausts?

A

ULC & CSA

47
Q

A commercial kitchen exhaust should be what pressure?

A

Under a slight negative pressure

48
Q

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

A

Has to be approved for grease removable

Commercial and Industrial HVAC (2 decks)

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