Flammable storage cabinets reduce fire risk from flammable liquids. Unvented cabinets are generally preferred because venting can compromise fire protection. If venting is required by code or the authority having jurisdiction, use a continuous mechanical exhaust discharging above the roof, provide top fresh-air inlet and bottom exhaust, fit flame arrestors in both ports, use welded compatible ducting (not PVC or dryer vents), and follow manufacturer and AHJ requirements. Keep cabinets away from exits, separate incompatible chemicals, use listed cabinets, label clearly, and inspect regularly.

Purpose and when you need a cabinet

Flammable storage cabinets are designed to reduce fire risk from flammable and combustible liquids. Whether you need one depends on the class of liquid, the total quantity, and the cabinet's location. Follow applicable regulations and the authority having jurisdiction (AHJ) for allowed quantities and placement.

Venting: generally discouraged

Most manufacturers and fire codes treat venting cautiously. Venting a cabinet can reduce its fire-protection effectiveness by allowing flame, heat or smoke pathways. For routine storage, unvented cabinets are the preferred option. If you think venting is necessary - for odor control or large inventories - discuss it with the cabinet manufacturer and your AHJ before modifying the unit.

If you must vent: strict controls

If code or the AHJ allows venting, apply these controls:

Mechanical exhaust to outdoors

Use a continuous mechanical exhaust system that discharges above the roof. Do not recirculate exhausted air back into the building.

Ports, airflow and flame arrestors

Provide a fresh-air inlet at the top and an exhaust at the bottom to promote downward airflow. Install flame arrestors or approved filters in both ports and inspect them regularly to prevent blockage.

Ducting and connections

Use welded, noncombustible ducting compatible with the stored liquids. The duct material should be at least as robust as the cabinet construction (cabinet bodies are commonly 18-gauge or heavier steel). Do not use stovepipe, dryer vents, or PVC for exhaust lines.

Safe siting and use

  • Do not place the cabinet adjacent to an exit or in a way that blocks egress.
  • Keep incompatible materials separate: do not store strong acids, oxidizers, or corrosives with flammables; corrosives can damage cabinet interiors.
  • Use approved containers and keep liquids in their original, labeled containers when possible.
  • Label the cabinet clearly (e.g., "FLAMMABLE - KEEP FIRE AWAY") and provide secondary hazard signage if required.
  • Ensure any transfers from containers follow bonding and grounding procedures to control static when dispensing.

Inspection and approvals

Buy cabinets that are listed by recognized testing agencies (for example, FM or Underwriters Laboratories). Inspect vents, flame arrestors, gaskets, hinges, and seals periodically and repair or replace damaged cabinets promptly.

Final word

Unvented flammable storage cabinets are safer for most applications. When venting is necessary, follow the cabinet manufacturer, facility safety program, and your AHJ for specific requirements to preserve fire protection and protect occupants.

FAQs about Flammable Storage Cabinet

Are flammable storage cabinets allowed to be vented?
Venting is generally discouraged because it can weaken the cabinet's fire protection. Vent only with approval from the cabinet manufacturer and the authority having jurisdiction, and follow strict controls if allowed.
If I vent a cabinet, where should the exhaust go?
Exhaust must be continuous mechanical ventilation that discharges above the roof; do not recirculate exhaust into occupied spaces.
What materials are prohibited for exhaust ducting?
Do not use stovepipe, dryer vents, or PVC for cabinet exhaust. Use welded, noncombustible ducting compatible with the stored liquids.
Can I store acids or corrosives in a flammable storage cabinet?
No. Acids and corrosives can damage cabinet interiors and should be stored in dedicated, compatible cabinets.
How should I inspect a cabinet that is vented?
Check flame arrestors and ports for blockage, inspect gaskets, hinges and seals, confirm duct integrity and welds, and verify the exhaust terminates above the roof as required.

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