Storage Hazard Calculator

Figure out the applicable NFPA 13 storage protection in seconds. Enter your commodity class, storage arrangement, and ceiling height, and get the design options side by side — with density, demand, and the exact code references.

What it does

Storage sprinkler protection is one of the trickiest calls in fire sprinkler design — the right scheme depends on commodity classification, storage method, storage and ceiling height, and aisle width, and the figures live across many NFPA 13 sections. This tool walks the criteria for you and lays out every applicable option:

• CMDA (control mode density/area) ceiling-only and with in-rack sprinklers
• CMSA (control mode specific application)
• ESFR (early suppression fast response)
• In-rack sprinkler arrangements

For each option you get the ceiling density and design area, in-rack demand, hose allowance, total water demand, and the figure/section it came from — so you can compare schemes and justify the one you pick.

How to use it

1. Choose your NFPA 13 edition and commodity (e.g., cartoned unexpanded Group A plastic).
2. Set the storage arrangement, storage height, ceiling height, and aisle width.
3. Review the recommended criteria and filter by protection type.
4. Copy the design text straight into your calc package or narrative.

FAQ

Is it really free?

Yes — this calculator is free to use with no login. It's part of SprinkFlow; the Windows desktop app is free to download and explore, with a $39/month membership to export your deliverables.

Which NFPA 13 editions are supported?

Recent editions, with the criteria mapped to the corresponding figures and sections.

Can I use it on my phone?

Yes. It's also part of the free SprinkFlow mobile app — add it to your home screen and it works in the field, even offline.