Buying a used Adflo? The pre-purchase inspection and counterfeit-filter checklist

The bargain only starts after the questions

A cheap used Adflo is only cheap if the identified system can be inspected, documented and recommissioned. A listing photograph and a spinning motor do not establish its configuration, filter provenance, battery condition or service history. That does not make every unknown a fault. It makes it a question to settle before you bid.

The fair test is whether you can turn the listing into a documented-and-serviceable system with a sensible recommissioning plan. Sometimes the answer will be yes. Sometimes you should ask for more evidence. If the identity, condition or work required remains too uncertain, you can walk away without regret and price a current new system instead.

The aim is not to frighten you away from second-hand PAPR equipment. It is to make five hard seller questions — what is it, what is included, which documents apply, where did the filters come from, and what history can be evidenced — feel reasonable.

Is used RPE even allowed?

There is no blanket rule making used RPE illegal or unsuitable. HSE’s PUWER Approved Code of Practice L22 applies to work equipment whether it is new, existing or second-hand. It requires suitable equipment to be maintained in an efficient state, in efficient working order and in good repair.

For RPE, that leaves the practical responsibility with the employer. You still need to demonstrate that the complete system is suitable and serviceable for the hazard, wearer, task and environment, and that it will be properly maintained. A familiar brand name or a motor that starts is not that demonstration.

This is why “used” and “unsafe” are not synonyms. The useful distinction is between a documented-and-serviceable system and one that cannot be commissioned responsibly with the evidence and condition available.

Before you bid on a used Adflo: identify the exact system

Ask the seller for clear photographs of every label and part number, plus an itemised answer to “what is included?” Include the headtop, blower, breathing tube, filter cover, belt, battery, charger, filters and any loose components in that conversation. A broad “used Speedglas air-fed helmet” title cannot establish the exact configured system or whether parts belong together.

Request the service or examination history, original invoice if available, Declaration of Conformity (DoC) and instructions for that configuration. Official instructions can be downloaded, but an accessible EMEA PDF is not necessarily the current UK issue for the equipment in front of you. Identify the system first, then obtain the current instructions and applicable DoC rather than fitting a convenient document to a vague listing.

The EN 12941 edition cited in current documentation is also a purchase-time question. Our EN 12941:2023 buyer’s document check explains that issue fully. Here, the rule is simpler: never infer an edition, conformity route or component compatibility from a broad listing title.

An omission is still only an omission. If the listing does not mention a charger or examination record, ask whether it is supplied or available; do not report it as missing until the seller confirms.

Counterfeit Adflo filters: check the evidence, not just the colour

3M UK’s Genuine PPE guidance specifically warns about counterfeit filters for the Adflo PAPR system. Its counterfeit welding-fume filter bulletin covers Adflo particulate filters and says counterfeit or copycat filters may be missing abbreviated label information.

3M’s PAPR-specific awareness bulletin 2543299O carries the same marking checklist.

For an approved filter, check the information the bulletin lists (the lot number and expiration date sit on the filter opposite the label):

• approval holder’s name and brand;
• filter classification and part number;
• CE marking;
• lot number; and
• expiration date.

Treat this as an evidence check, not a shortcut to an accusation. A third-party prefilter, an item described as compatible, a copycat and a falsely branded counterfeit are different categories. “Compatible” alone does not mean counterfeit, and a photograph alone may not settle what an item is.

For recommissioning, fit genuine 3M consumables from a specialist supplier you can verify and go back to — we supply the genuine Adflo range and can check part numbers against the system you are considering. The wider market evidence supports care without supplying an Adflo-counterfeit rate: BSIF’s test-purchasing release (Jan 2025–Jan 2026 assessments) reports that 82% of PPE bought from non-registered suppliers failed, 84% of RPE tested had ineffective filters, and Registered Safety Suppliers achieved 96% compliance. Those are general test-purchasing figures, not findings about the seller or filter you are considering.

Condition: inspect what you can and label what remains unknown

Once the part numbers and applicable instructions are clear, inspect the system against those instructions. Look at the housing, seals, breathing tube, filter cover, belt, labels and every included component. Photographs can help you decide whether to continue, but they are not a remote diagnosis of serviceability.

At handover, where possible, ask the seller to demonstrate the manufacturer-prescribed airflow and alarm check using airflow indicator 838020. The ball should be at or above its minimum-flow mark. The verified Adflo context is a minimum design airflow of 160 l/min, nominal flow of about 170 l/min, and a five-step loading indicator with three green and two red steps. These checks show how the unit behaves at that moment; they do not prove its full history or the condition of every component.

Because airflow is automatically regulated, a faster-running motor or unexpectedly short battery duration can indicate a loaded filter. That is a reason to inspect against the current instructions, not a diagnosis of the whole system.

Battery age is usually an honest unknown. Ask for photographs of every battery label, the invoice, charging history and a demonstrated runtime. The manufacturer’s context of approximately 500 charge cycles is not a date decoder, a guarantee of remaining runtime or a promise that the next charge will behave like the last.

A failed check, damaged part or unexplained label gives you something concrete to cost or investigate. Uncertainty that the seller cannot resolve belongs in the cost stack too.

Build the recommissioning cost stack

There is no single “true recommissioning cost” for a used unit. Build a line-by-line stack for the system you have identified:

Keep “unknown” visible instead of quietly pricing it at zero. A battery with no useful history is not automatically dead, but neither is it reasonable to treat it as having known remaining life. The same discipline applies to filters and missing service records.

3M publishes replacement Adflo products and parts, but an expressly Adflo-authorised UK repair route was not verified for this brief. Ask for an Adflo-specific assessment or quotation rather than assuming a repair centre will accept the unit or that a repair outcome is assured.

Our Adflo consumables and fleet-budgeting guide covers genuine-parts economics and ongoing replenishment. Use it after this acquisition stack has shown whether the apparent saving survives first commissioning.

Before first workplace use: record a baseline examination

Before putting a second-hand system into workplace use, arrange and record a thorough baseline examination and appropriate functional testing against the identified system and current instructions. This is prudent commissioning practice applying the normal before-use and continuing duties; it is not an HSE quotation or a separate “acquisition examination” rule.

HSE’s welding RPE maintenance guidance says RPE must be thoroughly inspected before each use. For reusable RPE, it also requires records of regular examinations, maintenance, repairs and appropriate testing. HSG53 supports thorough examination and appropriate testing at suitable intervals, with examination, test and repair records retained for at least five years.

Record the starting configuration, condition, parts replaced, airflow and alarm result, other appropriate tests, findings and actions. Then carry that baseline into the employer’s normal arrangements. Our powered-air RPE compliance records guide provides the continuing examination-log route; this article does not replace it.

When new is the cheaper, clearer answer

Walk away when the evidence gap is larger than your appetite for uncertainty. If you cannot establish the exact system, applicable instructions and DoC, filter provenance, physical condition or a credible recommissioning scope, the unit cannot be commissioned responsibly on the information available.

That is not a verdict on all used equipment, and it need not be a verdict on the seller’s honesty. It is a buying decision: a current new system may cost less once missing parts, uncertain battery life, examination, testing and possible repair are counted. Our powered welding respirator cost guide is the honest new-versus-used off-ramp.

Colleges sit in the same practical position as other workplace dutyholders. A donated or inherited unit does not remove the assessment, maintenance, examination, record and training duties. If you cannot establish a responsible path into service, gratitude for the donation should not force a poor commissioning decision.

Download: Used Adflo Pre-Purchase Check

The one-page Used Adflo Pre-Purchase Check turns the questions into a seller-and-handover record. It covers exact model and part numbers, what is included, DoC and instructions, service history, battery evidence and filter provenance. It also includes condition checkboxes, a possible airflow and alarm demonstration, and a blank item-by-item recommissioning cost table.

Used Adflo Pre-Purchase Check

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Use it as a suggested buyer’s aid, not a valuation or approval. It does not replace the employer’s risk assessment, current manufacturer documentation or workplace examination arrangements. Its walk-away line is deliberately plain: if configuration, provenance or serviceability cannot be evidenced sufficiently to commission the system responsibly, price a current new system instead.

Frequently asked questions about buying a used Adflo

Is it legal to use second-hand RPE at work?
There is no blanket bar on second-hand work equipment. The employer must still demonstrate that the complete RPE system is suitable, serviceable and maintained for its hazard, wearer, task and environment before it is used.

How do I spot counterfeit Adflo filters?
Check provenance and the bulletin’s abbreviated-label information: approval holder, brand, classification, part number, CE mark, lot number and expiry date. Missing or unclear information warrants a question, not an instant accusation. Recommission with genuine 3M consumables — and if you are unsure about a filter’s provenance, ask us to check it against the genuine part numbers.

Does the 3M warranty transfer?
Do not assume it does. A UK Adflo warranty transfer rule was not verified for this brief. Ask for the original sales documents and obtain a product-specific answer; do not include warranty value in the deal unless it is evidenced for that unit.

Can I tell how old the battery is?
Do not assume a label provides a universal manufacture-date code. Ask for all labels, the invoice and charging history, then request a runtime demonstration. Even with that evidence, remaining life is not guaranteed.

The unit has no instructions — deal-breaker?
Not automatically. First identify the exact configuration, then obtain the current applicable instructions and DoC. A downloadable manual for another revision or a broadly named system is not enough. If you cannot match reliable current documents to the equipment, pause rather than guess.

Ask TFMS to check the stated configuration