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Questions and Answers
Service openings in air ducts must be identified with letters to:
Service openings in air ducts must be identified with letters to:
- Indicate the location of the fire protection device(s) within. (correct)
- Identify them as service openings.
- Indicate compliance with safety standards outlined in the ASHRAE Handbook.
- Indicate compliance with safety standards outlined in ASTM C411.
What minimum height must letters identifying service openings in air ducts have?
What minimum height must letters identifying service openings in air ducts have?
- 3/4 inch
- 7/8 inch
- 1 inch
- 1/2 inch (correct)
Outside air intakes should be located to minimize the introduction of fire into the building, or the intakes shall be equipped with an approved:
Outside air intakes should be located to minimize the introduction of fire into the building, or the intakes shall be equipped with an approved:
- Smoke damper
- Fire damper
- Both A and B (correct)
- Smoke detector
Air ducts must be permitted to be ____, and shall be constructed of materials and sealed to satisfy use requirements for the air duct system.
Air ducts must be permitted to be ____, and shall be constructed of materials and sealed to satisfy use requirements for the air duct system.
What is the maximum permissible clearance from metal air ducts to combustible materials, including plaster on wood lath?
What is the maximum permissible clearance from metal air ducts to combustible materials, including plaster on wood lath?
Class 0 or Class 1 rigid or flexible air ducts shall not be used as vertical air ducts that are more than ___ stories in height.
Class 0 or Class 1 rigid or flexible air ducts shall not be used as vertical air ducts that are more than ___ stories in height.
Air connectors shall not pass through any wall, partition, or enclosure of a vertical shaft required, unless the assembly has a fire resistance rating of at least:
Air connectors shall not pass through any wall, partition, or enclosure of a vertical shaft required, unless the assembly has a fire resistance rating of at least:
Outside air intakes should be located to minimize the introduction of what into the building?
Outside air intakes should be located to minimize the introduction of what into the building?
Air connectors are restricted from passing through:
Air connectors are restricted from passing through:
To avoid potential hazards, what should installations avoid creating when electrical, fossil fuel, or solar energy collection heat sources are installed in air ducts?
To avoid potential hazards, what should installations avoid creating when electrical, fossil fuel, or solar energy collection heat sources are installed in air ducts?
Flashcards
Service openings identification
Service openings identification
To indicate the location of the fire protection device(s) within
Service opening label height
Service opening label height
Service openings in air ducts must be identified with letters having a minimum height of 1/2 inch.
Outside air intake location
Outside air intake location
Minimize the introduction of smoke or fire into the building through outside air intakes.
Air duct construction
Air duct construction
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Metal duct clearance
Metal duct clearance
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Air connector fire rating
Air connector fire rating
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AC duct height
AC duct height
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Smoke detector capacity
Smoke detector capacity
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Study Notes
- These notes pertain to NFPA 90A, 2018 Questions and Answers
Air Ducts and Openings
- Service openings in air ducts require identification via letters indicating the location of fire protection devices within.
- Service openings in air ducts are to be identified with letters at least ½ inch in height.
- Outside air intakes should minimize fire introduction from combustible buildings and hazardous facilities.
- Alternatively, intakes should have an approved fire or smoke damper.
- Air ducts may be rigid or flexible, constructed to withstand system pressures and sealed, to meet the air duct system requirements.
- Metal air ducts need a clearance of less than ½ inch from combustible materials, including plaster on wood lath.
- Class 0 or Class 1 rigid or flexible air ducts shouldn't serve as vertical air ducts exceeding two stories.
- Air connectors must not pass through any wall, partition, or vertical shaft enclosure with a fire resistance rating of 1 hour or more.
- Outside air intakes should be located to minimize the introduction of fire.
- Air connectors should not pass through floors.
- Outside air intakes limit drawing in fire or smoke.
- Installations with electrical, fossil fuel, or solar energy collection heat sources in air ducts must not create a fire hazard.
- Smoke dampers must be installed no more than 2 feet from the smoke barrier or the first air duct inlet/outlet, whichever is nearer to the smoke barrier.
- Supplementary materials for air distribution systems should be tested with applied adhesives
- Adhesives should have a maximum flame spread index of 25 and a maximum smoke developed index of 50 when in the final dry state.
System Operations and Components
- In a system normally operating at 184°F, fusible links should have a temperature rating of 234°F.
- Air filters need replacement when airflow resistance doubles from the original resistance.
- According to ANSI/UL 181, Class 0 or Class 1 duct materials shouldn't be used in vertical ducts exceeding two stories.
- Liquid adhesive coating used on air filters must have a minimum flash point of 325°F.
- Fusible links should be rated approximately 50°F above the maximum temperature typically encountered when the system is in operation or shut down.
- NFPA 90A applies to systems moving environmental air in structures serving spaces over 25,000 cubic feet in volume.
- Air conditioning duct system outlets and inlets need to be located at least 3 inches above the floor.
- Approved smoke detectors for duct installation in single-story buildings must shut down fans in systems exceeding a capacity of 944 liters per second.
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