This question causes quite the debate during our audits/assessments! My record is 27 full-size cabinets in a single control area. It was actually inside a single, but large room that had NO fire ratings. And when I began to question the number and load of flammables in the room, you would have thought I shot someone’s puppy. So the question is:
How many Flammable Cabinets can I have inside a single control area?
I will first use the International Fire Code and then NFPA 30 to explain these limitations.
The International Fire Code (IFC) does NOT mandate a strict limit on the physical number of flammable storage cabinets we can have in a single control area. Instead, IFC Chapters 50 and 57 regulate storage by capping the Maximum Allowable Quantity (MAQ) of the liquids themselves. Here is how the limits are calculated and applied for dual compliance in an industrial setting:
Under IFC Chapter 50 (Hazardous Materials) and Chapter 57 (Flammable and Combustible Liquids), our limit is based on the volume and class of the liquids, NOT the physical cabinet count.
- Table 5003.1.1(1) establishes the base MAQ for flammable liquids based on their class (e.g., 30 gallons for Class IA, 120 gallons for Class IB/IC).
- Per Section 5003.1.1, storing these liquids in approved flammable liquid cabinets (constructed per Section 5704.3.2.1) allows us to increase the base MAQ by 100%.
- If the ENTIRE building is equipped with an automatic sprinkler system, the MAQ can be increased by another 100%.
These multipliers get us up to 480 gallons per control area. Start with 120 gallons, cabinet use gets us to 240 gallons and the sprinkler system gets us to 480 gallons.
As long as the aggregate volume of all flammable liquids inside the control area remains under the final calculated MAQ, the IFC does not restrict whether that volume is distributed across multiple cabinets.
While the IFC relies on MAQ, occupational safety regulations take a different approach. You will also need to account for OSHA 29 CFR 1910.106 and NFPA 30, which do restrict the physical cabinet count:
- OSHA and NFPA 30 generally restrict you to a maximum of three (3) flammable storage cabinets per single fire/storage area.
- Under NFPA 30, industrial facilities may place additional groups of up to three cabinets in the same fire area, provided each group is separated by AT LEAST 100 feet. If the area is protected by an appropriately designed automatic sprinkler system, a single group can be increased to six (6) cabinets.
- If our storage needs to exceed these cabinet limits, the codes require the construction of a dedicated inside liquid storage room or hazardous material storage area.
Regardless of the number of cabinets, both codes cap what a single approved cabinet can legally hold:
- IFC / NFPA 30: Maximum of 120 gallons of combined Class I, II, and IIIA liquids.
- OSHA: Stricter cap of 60 gallons maximum for Category 1, 2, or 3 (Class I and II) liquids per cabinet.
To satisfy both the building fire code and occupational safety audits, the standard engineering practice is to keep the aggregate volume below the control area’s MAQ while capping the physical cabinet count at three per fire area (or six if properly sprinklered).