Practice Exam Questions And Correct Answers

FDNY W49: Supervision of Storage, Handling

and Use of Aerosols at Construction Sites Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

1.What is the primary hazard associated with aerosol products at construction sites?

• Electrical shock
• Slip hazards
• Flammability and explosion risk
• Noise generation

Rationale: Aerosols often contain flammable propellants under pressure,

creating fire and explosion hazards.

2. 1 / 4

Which FDNY document governs aerosol storage and use requirements?

• FDNY Code Chapter 7
• FDNY Fire Code Chapter 28

C. NFPA 72

D. OSHA 29 CFR 1926

Rationale: Aerosols fall under compressed gases and flammable materials

rules in Chapter 28 of the Fire Code.

3.

Aerosols stored on construction sites must be kept:

• Anywhere tools are stored
• In open sunlight
• In approved, secured, well-ventilated locations
• Near heat sources

Rationale: Approved, controlled, ventilated storage areas reduce ignition

and pressure-build risk.

4.

The W-49 certificate holder is responsible for:

• Only keeping the storage room locked
• Only transporting aerosols
• Supervising storage, handling, use, and compliance 2 / 4

• Only maintaining paperwork

Rationale: W-49 requires full operational supervision of all aerosol-related

fire safety practices.

5.Aerosol containers must be kept at least how far from ignition sources?

• 1 foot
• 2 feet
• 3 feet
• 8 feet

Rationale: FDNY standards and general flammable-materials practices

require a minimum 3-foot separation.

6.

Damaged aerosol cans must be:

• Repaired using tape
• Used immediately
• Removed from site and disposed per safety procedures
• Stored with full cans

Rationale: Damaged cans may leak, overheat, or rupture. They must be

removed immediately.

• / 4

7.Which classification applies to most flammable aerosol products under NFPA?

• Class I
• Level 1 or Level 2 aerosols
• Class C
• Type R

Rationale: NFPA categorizes aerosol flammability into levels, commonly 1

or 2 for construction products.

8.What must be posted in aerosol storage rooms?

• Employee schedule
• Holiday calendar
• “No Smoking/No Open Flames” signs
• Construction plans

Rationale: Posting reduces ignition-source risks and is required for

flammable materials areas.

9.Aerosols should not be stored above what temperature?

• 80°F
• / 4