Grease Containment Systems Quiz

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Questions and Answers

What is the primary purpose of a grease duct?

To evacuate cooking odors from the kitchen.

To collect and direct grease to a safe collection point.

To filter lint and grease from the air.

To reduce the accumulation of combustible condensation. (correct)

Which type of grease filter is not acceptable for commercial cooking operations?

Inline grease filter

Mesh-type grease filter (correct)

Activated carbon filter

High-efficiency particulate air (HEPA) filter

What function does the high limit control serve in a deep fat fryer?

It automatically interrupts the thermal energy input if the temperature is exceeded. (correct)

It collects vapors and gases from cooking.

It filters grease from the air.

It removes smoke and odors from cooking.

What distinguishes a type I kitchen hood from a type II kitchen hood?

Type I is designed for grease and smoke, while type II is for steam and odors. Signup and view all the answers

What defines a grease-tight construction?

It prevents passage of grease under normal cooking conditions. Signup and view all the answers

What component is a fixed baffle associated with?

Grease removal system Signup and view all the answers

What is a key characteristic of grease removal devices?

They are designed to minimize airborne combustible matter. Signup and view all the answers

What is the primary function of a hood in a kitchen setting?

To collect and remove cooking-related contaminants. Signup and view all the answers

What is the minimum thickness requirement for aluminum ducts in Class 1 systems compared to steel ducts?

At least two Brown and Sharpe gauges thicker than steel ducts. Signup and view all the answers

What angle should branches connect to the main ducts in a duct system?

Not exceeding 45 degrees. Signup and view all the answers

What is the maximum allowable spacing for supports of ducts larger than eight inches?

Not exceeding 20 feet. Signup and view all the answers

What type of venting is required for ducts conveying explosive dusts?

Explosion vents. Signup and view all the answers

How often should accessible cleanouts be provided in duct systems?

At intervals of ten feet. Signup and view all the answers

What must the ductwork designed for pressure relief withstand at minimum when relief devices cannot provide sufficient pressure relief?

100 pounds per square inch. Signup and view all the answers

What should be considered in the design of duct supports when sprinkler protection is provided?

The weight of the duct filled with water or material with higher density. Signup and view all the answers

What material should hangers and supports exposed to corrosive atmospheres be made of?

Type 316 SS or equivalent. Signup and view all the answers

What is the minimum clearance required from combustible materials for duct systems operating above 140F?

18 inches (457 mm) Signup and view all the answers

Which method is NOT acceptable for providing air circulation when using a wall protector?

Covering all edges tightly Signup and view all the answers

What is the required distance for exhaust ducts conveying explosive vapors from property lines?

30 feet (9,144 mm) Signup and view all the answers

What is the minimum distance that exhaust outlets for other products must be from openings into the building?

10 feet (3,048 mm) Signup and view all the answers

How should a wall protector be mounted on a single flat wall for air circulation?

Leaving top and bottom edges open with a 1 inch air gap Signup and view all the answers

What should be done for ducts installed in locations vulnerable to physical damage?

Protect them with suitable guards Signup and view all the answers

What is the height requirement for exhaust outlets above adjoining grade for explosive or flammable materials?

10 feet (3,048 mm) Signup and view all the answers

What is required for cooking equipment producing smoke or grease-laden vapors?

An exhaust system that meets specific performance requirements Signup and view all the answers

What is the minimum clearance required to combustible materials when using a clearance reduction system made of 0.013 in. sheet metal?

9 inches (229 mm) Signup and view all the answers

Which material is specified for use with a clearance reduction system that allows a minimum clearance of 3 inches?

0.027 in. sheet metal on mineral wool batts Signup and view all the answers

What is the purpose of protection provided to the wall from the bottom of the hood to the floor?

To ensure fire protection compliance Signup and view all the answers

What should be done if the clearance reduction material is damaged?

Repair or restore it to meet intended listing Signup and view all the answers

Which of the following is NOT a requirement for zero clearance to limited combustible materials?

Ceramic materials for safeguarding Signup and view all the answers

Who is responsible for inspecting the duct and its enclosure after a fire incident in a kitchen exhaust system?

Qualified personnel Signup and view all the answers

What is the minimum clearance to combustible materials when using a clearance reduction system made of 0.027 in. sheet metal?

3 inches (76 mm) Signup and view all the answers

What type of materials can be used to protect limited combustible materials to achieve zero clearance?

Materials listed for reducing clearance Signup and view all the answers

What must occur upon activation of a fire extinguishing system for a cooking operation?

All heat-producing fuel and electric power sources shall automatically shut off. Signup and view all the answers

Which type of cooking operation is exempt from automatic fuel shutoff upon activation of the fire extinguishing system?

Solid fuel cooking operations. Signup and view all the answers

What is the maximum distance for manual activation from the protected kitchen appliances?

20 feet. Signup and view all the answers

Which of the following is true about the manual and automatic means of activation in a fire extinguishing system?

They can be separate so that failure of one does not impair the other. Signup and view all the answers

What force requirement is associated with manual actuation using a pull station?

No more than 40 pounds. Signup and view all the answers

What type of indication must be provided upon activation of the fire extinguishing system?

An audible alarm or visual indicator. Signup and view all the answers

Which statement is true regarding gas appliances under the same ventilating equipment?

They must shut off automatically upon activation of any extinguishing system. Signup and view all the answers

What is required for the manual actuation devices in terms of power source?

They may use electrical power if a standby power supply is provided. Signup and view all the answers

Study Notes

Grease Ducts

A containment system designed to prevent the build-up of combustible condensation and damage in case of fire.

Grease Filters

Movable components of grease removal systems designed to capture and direct grease to a collection point.
Minimize flame projection downstream when exposed to flame upstream.
Expected to maintain strength, shape, and integrity under rough handling, cleaning, and field service.

Grease Filters, Mesh-Type

General purpose air filters that collect lint and grease.
Not tested or acceptable for commercial cooking operations due to increased fire hazard.

Grease Removal Devices

Systems designed to process vapors, gases, and air while collecting combustible matter.
Concentrate combustible matter for further processing.
Leave exiting air with a lower amount of combustible matter.

Grease Tight

Constructed and performs in a way that prevents grease passage under normal cooking conditions.

High Broiler

synonymous with Upright Broiler

High Limit Control

An operating device in deep fat fryers that serves as a secondary temperature limiter.
Automatically interrupts thermal energy input if the cooking temperature is exceeded.

Hood

Air intake device connected to a mechanical exhaust system for removing grease, vapors, fumes, smoke, steam, heat, or odors.

Fixed Baffle

Listed exhaust hood design with a non-removable grease removal assembly with a built-in fire-activated water wash system for extinguishing fires..

Hood Type I

Kitchen hood for removing grease and smoke.

Hood Type II

General kitchen hood for removing steam, vapor, heat, or odors.
Aluminum construction can be used in Class 1 duct systems only.

Duct Thickness

Aluminum ducts must be at least two (2) Brown and Sharpe gauges thicker than steel ducts in Tables 5-5 and 5-6.

Fittings

Fittings in Class 2, 3, and 4 systems must be at least two gauges thicker than straight runs.

Duct Systems

Flexible metallic duct can be used for connecting duct work to vibrating equipment.
Expansion joints are required for systems subject to temperature fluctuations.
Branches connect to main ducts at the large end of transitions at an angle not exceeding forty-five (45) degrees (0.79 radian).
Accessible cleanouts are required at ten (10) foot (3,048 mm) intervals and at changes in direction, except for ducts carrying non-corrosive vapors with no particulate.

Explosion Venting

Ducts conveying explosive dusts require explosion vents, openings protected by flashback swing valves, or rupture diaphragms.
Openings for explosive force relief should be located outside the building.
Ductwork must withstand an internal pressure of at least 100 pounds per square inch (689 kPa) if relief devices are insufficient.

Deflagration Venting

Areas with dust explosion hazards external to protected equipment must have deflagration venting to a safe outside location.

Duct Supports

Spacing should not exceed twelve (12) feet (3,658 mm) for eight (8) inch (203 mm) ducts or twenty (20) feet (6,096 mm) for larger ducts, unless justified by design.
Supports must carry the weight of the duct half-filled with material.
Hanger design must account for the weight of the duct half-filled with water or material, whichever has higher density, if sprinkler protection is provided.
Exceptions are granted where adequate drainage is present, and the weight of water is not a factor.

Duct Support Materials

Supports exposed to corrosive atmospheres must be Type 316 SS or equivalent.

Clearance Requirements

Duct systems operating at temperatures above 140°F (60°C) must be at least eighteen (18) inches (457 mm) away from combustible building construction or combustible materials.

Clearance Reduction Systems

A 0.013 in. (0.33 mm) (28-gauge) sheet metal clearance reduction system with noncombustible spacers requires a minimum of nine (9) inches (229 mm) clearance to combustible material.
A 0.027 in. (0.69 mm) (22-gauge) sheet metal clearance reduction system with mineral wool batts or ceramic fiber blanket on noncombustible spacers needs a minimum of three (3) inches (76 mm) clearance to combustible material.
Zero clearance to limited combustible materials is permitted where protected by metal lath and plaster, tile, or other non-ceramic materials, quarry or assembly of noncombustible materials, or listed materials for reducing clearance.

Clearance Integrity

Damaged material or products must be repaired or restored to meet their listing or clearance requirements and be approved by the authority having jurisdiction.
Following a fire, qualified personnel must inspect the duct and enclosure to ensure they can maintain their fire protection function and comply with the standard for continued operation.
Wall protection must extend from the bottom of the hood to the floor or to the top of noncombustible material extending to the floor, to the same level as required in 507.2.1.
Clearance reduction methods should be applied to the limited combustible structure and not the duct itself.

Fire Extinguishing Systems

Upon activation, all heat-producing fuel and electric power sources for equipment protected by the system must automatically shut off, except solid fuel cooking operations.
Steam supplied from an external source does not require automatic shutoff.
Gas appliances not needing protection but located under the same ventilation equipment must automatically shut off during system activation.
Shutoff devices require manual reset.

Manual Activation

A readily accessible manual activation device must be located between 42 and 48 inches above the floor, in a path of exit or egress, and clearly identify the protected hazard.
The device should be located between 10 and 20 feet from the protected kitchen appliance within the path of egress.
Cable-operated pull stations should not require more than 40 pounds of force to actuate, with a pull movement of no more than 14 inches.
Automatic and manual activation mechanisms should be separate and independent to prevent failure of one system impairing the other.

Common Activation

Common automatic and manual activation mechanisms are permitted if the manual activation devices are located between the control head or releasing device and the first fusible link.

Automatic Sprinkler Systems

Automatic sprinkler systems do not require manual activation.

Manual Actuator Power

Manual actuators can be mechanical or rely on electrical power for actuation.
Electrical power is permitted for manual activation provided there is a standby power supply or supervision per Section 513.7.

System Annunciation

Upon activation of an automatic fire extinguishing system, an audible alarm or visual indicator must be provided to indicate system activation.

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Description

Test your knowledge on grease duct systems, grease filters, and grease removal devices. This quiz covers the specifications, functions, and safety measures associated with these essential components in commercial cooking environments. Understand the importance of proper grease management to prevent fire hazards.