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NFPA 660 Compliance Checklist 18 Points to Check
Download the 18-point PDF and check your facility against NFPA 660 in about five minutes. It works the same whether you run a 10-person weld shop or a large aerospace plant.
NFPA 660 took effect January 1, 2026. Six dust standards became one, and this is the plain-language version of what it asks for.
NFPA 660 is the consolidated U.S. combustible dust standard, effective January 1, 2026. This free PDF is an 18-point self-check for manufacturing facilities. You can grab it below and find your compliance gaps in five minutes. For the plain-English explainer of what the standard requires, see our NFPA 660 guide.
What Changed
NFPA 660 Is Now the Standard. Here’s What That Means for You
On January 1, 2026, NFPA 660 became the single consolidated combustible dust standard, replacing NFPA 61, 484, 652, 654, 655, and 664. If your facility generates combustible dust, this is the standard your fire marshal and insurance carrier are now referencing.
Every facility with combustible dust needs a completed Dust Hazard Analysis (DHA), explosion protection that fits your dust, and the documentation behind both. If you’re working from a documentation set that still cites 652 or 654 as the governing standard, our transition guide walks through what carried forward and what needs updating.
Curious how prepared the industry actually is? We posed as a Phoenix-area metal fab shop and called 38 dust collection contractors. Our investigation of 38 dust collection contractors documented what we heard.
The short version: If your current system was designed to the legacy standards, you’re probably close. But “close” isn’t compliant. This checklist shows you which gaps are left.
Where the Gaps Live
The Pattern Is Consistent and Predictable
Most facilities follow the same pattern: a system designed to the legacy NFPA 652 or 654 standards is usually close to compliant, but “close” isn’t compliant. The gaps cluster in predictable categories.
Missing or outdated DHAs that don’t reference the unified standard. Explosion protection sized for the wrong KSt range. Isolation devices that were never installed because they weren’t on the original drawings. Documentation that hasn’t kept up with the process. Housekeeping records that show intent but not measured compliance against the layer-depth and floor-area thresholds in the standard.
Those are the categories this checklist walks you through. Understanding your dust’s KSt value and explosion severity classification is the foundation of everything NFPA 660 requires. Without your KSt, there is no way to properly size venting, suppression, or isolation.
What’s Inside the PDF
Your 18-Point NFPA 660 Self-Check, in 4 Sections
4 points covering DHA validity under NFPA 660, dust testing requirements (KSt, Pmax, MIE, MIT), process flow documentation, and scope justification for covered vs uncovered areas.
5 points covering collector-type fit (cartridge vs baghouse vs wet), ductwork transport velocity, deflagration venting per NFPA 68, isolation devices, and equipment placement.
5 points covering dust layer depth limits, cleaning methods, hot work permits, electrical classification per NFPA 70, and ignition source control programs.
4 points covering your written combustible dust safety program, employee training records, Management of Change (MOC) process, and contractor safety controls.
Each of the 18 points spells out what a good answer looks like in specific terms, so you can check your own floor against it.
Each point also names the gap we see most often, so you know where to look first.
A 3-tier score tells you where you stand: start with the foundation (0 to 12), real work to do (13 to 15), or solid (16 to 18), with the next move for each tier.
Where to start when you find gaps, and how to go through your list with us when you want a second set of eyes.
90 seconds on what NFPA 660 asks of you: the DHA, why nobody certifies equipment, and what compliant looks like on the floor. The checklist below is the 18 points from that video.
Before you download: we called 38 dust collection contractors posing as a fab shop that needed to meet NFPA 660. Three could explain it. Sixty seconds on what that means for the vendor you pick. Full report here.
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Who This Is For
Industries That Need This Checklist
If your operation generates dust from any of these materials, NFPA 660 likely applies to you, and this checklist will show you where your facility stands.
The Honest Section
When This Checklist Isn’t Right for You
Skip the download if any of these are true:
- Your facility doesn’t generate, handle, or store combustible dust. NFPA 660 doesn’t apply to your operation.
- You run a single portable extractor on one welder, grinder, or CNC station. A single portable unit doesn’t raise the system-level points this checklist covers.
- You’re a homeowner, hobbyist, or single-operator shop without a documented dust collection system. This checklist is built for production facilities, not garage workshops.
Next Steps
Found Gaps in Your Checklist? Here’s What Comes Next
Get your DHA if you don’t have one
Your Dust Hazard Analysis is the foundation of NFPA 660 compliance. It identifies your combustible dust hazards using lab-tested data on your own dust. It is completed by you or a qualified third party. The cost breakdown is in our DHA cost guide.
Design the right system for your facility
Based on your DHA results, our dust collection design team designs a system around those findings. If your dust is combustible, that starts with the right combustible dust collection system for your material. You get a design drawing with airflow calculations that you own and can take to your own engineers. For budgeting, see our 2026 cost guide.
Install, verify, and document
Installation by an independent ICAP Certified crew or your own contractor, whichever you choose. Startup support and performance verification come with it, and airflow readings are recorded for your file. After that, filters and parts through our maintenance programs keep the system running the way it was designed.
Failed a DHA? You have a road map for that
If your DHA turns up problems with your current setup, that is what it is for. We wrote a clear 30-day fix-it road map for failed dust hazard analysis with real costs, timelines, and common mistakes to avoid.
Need to spread the investment? We offer financing options with zero down and fixed monthly payments.
Common Questions
NFPA 660: Questions Buyers Ask Us
Does NFPA 660 apply to my facility?
If your facility generates any combustible dust, NFPA 660 applies. That includes metals (aluminum, magnesium, titanium, zinc), wood dust, food and supplement powders (grain, sugar, flour, starch), plastics and resins, pharmaceutical powders, and textile fibers. NFPA 660 took effect January 1, 2026, replacing the legacy NFPA 61, 484, 652, 654, 655, and 664. For the plain-English explainer of what the standard requires, see our NFPA 660 guide.
What is a Dust Hazard Analysis (DHA) and how often does it need to be updated?
A DHA is a systematic review of your facility identifying where combustible dust exists, how it could ignite, and how to control the risk. Under NFPA 660 your DHA must be revalidated at least every 5 years and whenever the process changes (new equipment, new materials, production rate increases). A legacy DHA written under NFPA 652 or 654 needs to be explicitly revalidated against NFPA 660. More on DHAs and what they cost.
How much does a Dust Hazard Analysis cost?
DHA cost depends on facility size, number of distinct dusts, and process complexity. Small single-process facilities typically run $6,000 to $12,000. Larger multi-process plants run $18,000 to $45,000 or more. Dust testing (KSt, Pmax, MIE, MIT) is separate and runs $1,200 to $2,500 per dust sample at a recognized lab. Full DHA cost breakdown.
What changed between NFPA 660 and the older standards?
NFPA 660 consolidates the previously separate standards into one unified document with consistent requirements across all combustible dust industries. The biggest practical changes are stronger DHA documentation requirements, clearer rules on isolation devices to prevent deflagration propagation, more specific housekeeping thresholds, and explicit Management of Change requirements tying DHA updates to facility modifications. For the full plain-English breakdown, see our NFPA 660 explainer. For documentation that still cites the legacy standards, see our transition guide.
What happens if my facility fails a Dust Hazard Analysis?
A failed DHA is not a citation by itself. It’s the road map for what needs to change. Most failures cluster around isolation devices, deflagration venting sized to legacy standards, missing MOC documentation, and housekeeping records that don’t show actual compliance with depth thresholds. A focused 60-to-90-day fix plan can usually close most gaps without major capital spend. Our fix-it road map walks through exactly how.
Can I handle parts of NFPA 660 compliance in-house?
Yes, with the right knowledge. Housekeeping programs, training records, MOC procedures, and hot work permit systems are all in-house workstreams. The technical work (dust testing, the DHA, deflagration venting calculations, isolation device sizing) takes specialized expertise and recognized lab testing. Most facilities run a hybrid: in-house program management, outside expertise for the design and testing.
How long does it take to become NFPA 660 compliant?
From a clean start: dust testing takes 2-to-4 weeks at the lab. DHA execution takes 4-to-8 weeks depending on facility complexity. Design corrections (isolation, venting, ductwork modifications) typically run 8-to-16 weeks from order to install. Total realistic timeline from start to fully compliant is 4-to-7 months for a typical mid-size facility.
Close the easy gaps
A few points on this checklist close with a part number
Most of the 18 points need a judgment call about your specific process, and no catalog closes those. A few are different. If your checklist flagged differential pressure monitoring, filter condition, or no spare media on the shelf, those are parts you can price and order yourself today.
Closing them will not make you compliant on its own. It does clear the items that are only open because nobody got around to ordering the part.
The rest of this list is not a parts problem. Vent sizing, isolation, ignition source control, and the documentation behind them all depend on what your process actually generates. If those are the points you flagged, ordering a gauge will not move them.
Rather Go Through the Gaps With Us?
Skip the self-check. Tell us about your floor and we’ll help you sort which gaps matter most and where to start. When you’re ready, book your free system review. Zero obligation.
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