OSHA Aerosol Can Storage Requirements and Penalties

OSHA aerosol can storage requirements sit inside the flammable liquids standard at 29 CFR 1910.106, which classifies flammable aerosols as Category 1 flammable liquids and caps the amount you can keep loose in a work area at 25 gallons. Anything above that has to go into an approved flammable-liquid cabinet (60-gallon limit) or a fire-rated inside storage room built to specific construction, ventilation, and electrical standards. Labels, Safety Data Sheets, employee training, and nearby fire extinguishers apply on top of the storage rules, and penalties currently reach $165,514 per willful violation.

The 25-Gallon Threshold That Triggers Everything

The first number to know is 25 gallons. Up to that amount of Category 1 flammable liquid, which includes flammable aerosols, may be stored outside a cabinet or storage room within a single building or fire area. That is roughly 30 to 50 standard aerosol cans, enough to cover most small shops and maintenance areas.¹

Those loose cans still have to be kept in closed containers, away from ignition sources, with fire extinguishing equipment nearby. Once you cross 25 gallons, every can above that point has to go into a cabinet or a purpose-built storage room. There is no incidental-use carve-out beyond the threshold.

The Category 1 classification comes from 1910.106(d), and it is what pulls aerosol cans into the same regulatory bucket as gasoline. A can of flammable spray paint and a can of solvent-based lubricant are treated with the same seriousness as flammable liquids with a flash point below 73.4°F and a boiling point at or below 95°F.¹

Flammable Storage Cabinet Requirements

For most facilities, an approved flammable liquid storage cabinet is the compliance solution. The cabinet rules under 1910.106(d)(3) are precise, and inspectors check them line by line.

Capacity is capped at 60 gallons of Category 1, 2, or 3 flammable liquids per cabinet. Since flammable aerosols are Category 1, 60 gallons is your ceiling.
Walls, top, bottom, and doors must be at least No. 18 gauge sheet steel, double-walled with a 1½-inch air space. Joints must be riveted, welded, or otherwise sealed effectively.
The door must have a three-point lock, and the door sill must be raised at least 2 inches above the cabinet bottom to catch spills.
The cabinet must limit its internal temperature to 325°F or less during a 10-minute fire test on the standard time-temperature curve.
Every cabinet must be conspicuously labeled “Flammable — Keep Fire Away.”

No more than three approved cabinets may sit in a single fire area unless the total quantity across all cabinets stays within the room’s maximum allowable quantity for its occupancy class. Buying a cabinet already listed by a nationally recognized testing lab is the simplest way to satisfy the construction specs.¹

Inside Storage Room Requirements

If your aerosol inventory outgrows what cabinets can hold, 1910.106(d)(4) requires a dedicated inside storage room built to fire-resistance standards. These rooms cost more to build but allow substantially more storage.

Walls, floor, and ceiling must carry a 1-hour or 2-hour fire-resistance rating tested per NFPA 251. The rating you build to sets your capacity.
The room must be liquid-tight at the wall-to-floor joint. Openings to adjacent rooms need noncombustible raised sills or ramps at least 4 inches high, or the storage room floor must sit at least 4 inches below the surrounding floor. An open-grated trench draining to a safe location also works.
Every opening to another room needs an approved self-closing fire door.
Wiring and equipment in rooms holding Category 1 or 2 flammable liquids must be rated for Class I, Division 2 hazardous locations under Subpart S.
Every inside storage room must have gravity or mechanical exhaust ventilation providing at least six complete air changes per hour. Ventilation and lighting must run off a single switch located outside the door.

Capacity depends on the fire rating and whether the room has fire protection like sprinklers or a CO₂ system:

2-hour rated room with fire protection: up to 500 square feet, 10 gallons per square foot.
2-hour rated room without fire protection: up to 500 square feet, 5 gallons per square foot.
1-hour rated room with fire protection: up to 150 square feet, 4 gallons per square foot.
1-hour rated room without fire protection: up to 150 square feet, 2 gallons per square foot.

At the top end, a 2-hour rated room with sprinklers can hold up to 5,000 gallons of flammable aerosols.¹

Fire Extinguishers and Ignition Control

OSHA requires at least one portable fire extinguisher rated 12-B or higher near flammable aerosol storage. Placement rules are specific.

For storage rooms, the extinguisher must sit outside the room, no more than 10 feet from the door.
For cabinets or loose storage inside a building, the extinguisher must be positioned between 10 and 25 feet from the storage area.

Water-reactive materials cannot share a room with flammable liquids, which rules out storing certain specialty aerosol products alongside your general flammable stock.¹

When dispensing Category 1 or 2 flammable liquids between containers, the nozzle and the receiving container must be electrically bonded to prevent static sparks. A simple bonding wire or a grounded metal floorplate handles this.

Temperature and Ventilation

Inside storage rooms need the six-air-changes-per-hour ventilation described above. Cabinets have no ventilation requirement. You may vent a cabinet through a bung opening, but if you do, the vent must connect to the building’s exhaust system with proper fire protection at the connection, never open to the room.

OSHA does not set a specific maximum storage temperature for aerosol cans in 1910.106. Manufacturers universally recommend keeping cans below 120°F, and most product labels carry that warning. Above that temperature, internal pressure climbs and cans can rupture. In practice, that means keeping aerosol storage away from direct sunlight, steam pipes, furnaces, space heaters, and any other heat source that could push ambient temperature past the threshold.¹

Labels, Safety Data Sheets, and Can Condition

Under the Hazard Communication standard, 29 CFR 1910.1200, every aerosol can in the workplace must carry a legible English label identifying its contents and hazards. Manufacturers provide the initial label; employers are responsible for keeping workplace labels intact and readable.²

Employers must also keep a Safety Data Sheet on site for every hazardous aerosol product. The SDS covers 16 standardized sections including hazard identification, handling and storage guidance, fire-fighting measures, and first-aid procedures, and must be readily accessible to employees during their shifts.²

Physical condition matters too. Regular inspections should look for dents, corrosion, leaks, or bulging. A damaged can is a compromised pressure vessel, and a dented can in a warm cabinet is a fire waiting to happen. Pull damaged cans from storage immediately and route them through your waste procedures.

Employee Training

Anyone working around flammable aerosols must receive Hazard Communication training before their initial assignment and again whenever a new chemical hazard enters the work area. Training must cover:

How to detect a release of flammable aerosol, including visual cues, odors, and any monitoring equipment the employer uses.
The physical and health hazards of the specific products in use, including flammability, pressure, and toxicity.
Work practices, emergency procedures, and personal protective equipment the employer requires.
How to read container labels, find and interpret Safety Data Sheets, and locate the employer’s written hazard communication program.

Training can be organized by hazard category, covering flammability as a class, rather than product-by-product. That approach is practical for facilities using dozens of aerosol products.³

Penalties for Noncompliance

OSHA adjusts its civil penalty amounts each year for inflation. Under the adjustment effective after January 15, 2025, the maximum penalties are:

Serious violation: up to $16,550 per violation. This is the tier for hazards the employer knew or should have known about that could cause death or serious harm, such as storing flammable aerosols without an approved cabinet in a facility over the 25-gallon threshold.
Willful or repeated violation: up to $165,514 per violation. An employer previously cited for improper aerosol storage who fails to fix the issue, or who knowingly ignores the storage requirements, faces this tier.
Failure to abate: up to $16,550 per day beyond the deadline OSHA sets for correcting a cited hazard.

Each improperly stored container or missing safety measure can count as a separate violation, so penalties from one inspection stack quickly. A citation also creates a public record that can complicate insurance renewals and contract bids.⁴

A Note on Waste Aerosol Cans

OSHA governs storage while the cans are in use. Once a can becomes waste, whether it is empty, expired, or damaged, EPA’s Resource Conservation and Recovery Act rules take over, not OSHA. Used cans that have vented down to atmospheric pressure are considered RCRA-empty under 40 CFR 261.7 and can be recycled as scrap metal. Cans that still hold flammable or otherwise hazardous contents are managed as universal waste under 40 CFR Part 273, with their own labeling, one-year accumulation limit, and puncture-and-drain requirements.⁵⁶

1
eCFR. 29 CFR 1910.106 – Flammable Liquids
2
eCFR. 29 CFR 1910.1200 – Hazard Communication
3
Occupational Safety and Health Administration. 1910.1200 – Hazard Communication
4
Occupational Safety and Health Administration. OSHA Penalties
5
eCFR. 40 CFR 261.7 – Residues of Hazardous Waste in Empty Containers
6
eCFR. Part 273 Standards for Universal Waste Management