TL;DR
Passive HVAC air diffusers, grilles, and linear slot diffusers do not fall within the scope of any CE directive. Under Regulation (EU) 765/2008, affixing a CE mark to a product category that is not covered by a harmonized directive is considered improper labeling — regardless of where the product is manufactured.
The one exception is motorized fire/smoke dampers, covered by harmonized standard EN 15650. If what you’re specifying is a passive air terminal, you don’t need CE. You need the right test documentation instead. Here’s what to ask for.
Why this question keeps coming up
If you specify building products for European projects, you’ve seen CE marks on nearly everything — doors, glazing, insulation, cement, structural steel. It’s reasonable to assume air grilles and diffusers fall into the same bucket.
They don’t.
The confusion is understandable. The Construction Products Regulation (CPR 305/2011) only requires CE marking when a harmonized European standard (hEN) exists for a given product family. For some categories — windows, doors, ceramic tiles, curtain walling — hENs exist and CE is mandatory. For other categories, no hEN has ever been published, and therefore no CE mark applies.
Passive HVAC air terminals — supply registers, return grilles, linear slot diffusers, ceiling diffusers, T-bar clip-in grilles — fall into the second group. There is no hEN covering them. There is no CE directive that applies. A CE mark on one is, technically, non-compliant labeling.
The regulatory truth in three points
1. CPR only triggers CE when a hEN exists.
Article 4 of CPR 305/2011 states that a manufacturer must draw up a Declaration of Performance (and affix CE) “when a construction product covered by a harmonised standard is placed on the market.” If the product isn’t covered, neither the DoP nor the CE mark is required — or permitted.
2. No harmonized standard covers passive HVAC grilles.
CEN (the European standardization body) has never published a hEN for passive air diffusers, supply registers, or linear slot terminals. You can verify this against the official list of harmonized standards published in the Official Journal of the European Union.
3. EU 765/2008 Article 30 forbids improper CE affixation.
Regulation (EU) 765/2008, Article 30(2), explicitly prohibits affixing CE markings to products that are not subject to harmonized EU legislation requiring it. The regulation applies regardless of product origin — manufacturer country is irrelevant. Improper CE labeling is a surprisingly common misunderstanding in this industry, often more a result of regulatory confusion than intent, but the rule is the rule.
The one exception: motorized fire and smoke dampers
There is one HVAC product family where CE is both legitimate and mandatory: fire/smoke dampers with actuators, covered by the harmonized standard EN 15650.
These are different products from what most architects mean when they say “diffuser.” EN 15650 covers dampers that actively close on a fire or smoke signal, typically with a motorized or fusible-link mechanism. If your drawing calls for one of these, your supplier must hold a CE mark, a Notified Body (NB) assessment, and a valid Declaration of Performance referencing EN 15650.
At Hongyang HVAC, we don’t manufacture fire dampers. Our product scope is passive supply, return, and linear slot terminals in aluminum, PVC, and ABS. If your project requires EN 15650-certified fire dampers, that’s a separate supplier conversation — and we’ll say so upfront rather than try to cover the gap.
What to ask a diffuser supplier instead of “do you have CE?”
If CE isn’t the right question for passive diffusers, what is? Four questions that actually indicate regulatory competence:
- What is the reaction-to-fire class per EN 13501-1?
The core fire-safety classification used across European projects. Classes range from A1 (non-combustible) to F (no performance determined).
- Can you provide accredited material test reports?
Reports issued by ISO/IEC 17025-accredited laboratories. In China, this means CNAS-accredited labs, whose reports are ilac-MRA signed and mutually recognized in the EU.
- Does your aluminum product invoke CWFT?
Commission Decision 96/603/EC lists materials “classified without further testing” — aluminum with organic coating ≤1 mm is deemed Class A1 by regulation, no lab report required. A supplier who can cite this is one who understands the framework.
- Do you have a GB↔EN equivalence table?
For Chinese-sourced products, the Chinese GB fire standard maps directly to European EN: GB 8624 Class B1© ≈ EN 13501-1 Class C, GB/T 20284 = EN 13823 (SBI), GB/T 8626 = EN ISO 11925-2. A supplier who can produce this mapping has done the homework.
If you’re getting a clean answer to all four, you’re talking to someone who understands compliance. If you’re getting “yes we have CE,” you’re talking to someone who may not.
How to spot an improper CE mark in 30 seconds
Three quick checks that cut through any supplier PDF:
- Is there a four-digit Notified Body number next to the CE? Many construction products requiring CE must cite the NB that assessed them. If the mark is floating alone on a marketing sheet, that’s a flag.
- Can the supplier produce the matching Declaration of Performance? DoP is mandatory under CPR for any product with a legitimate CE mark. No DoP = no legitimate CE.
- Does their documentation cite a specific harmonized standard (hEN) number? A valid CE must reference its hEN (e.g., EN 15650, EN 14351-1). A supplier who can’t point to one likely doesn’t have legitimate grounds for the mark.
Thirty seconds. Three questions. It separates the suppliers who understand European regulation from those who’re guessing.
How Hongyang handles this
We don’t affix CE to our passive grilles or diffusers. Under the regulation, we can’t — and we won’t.
What we do provide:
- CNAS-accredited fire and material test reports (GB standards, ilac-MRA signed, recognized in the EU)
- GB↔EN equivalence tables showing the direct correspondence with European classification
- CWFT invocation for our aluminum products (6063-T5 extrusion without combustible surface coating → Class A1 without further testing, per Commission Decision 96/603/EC)
- Full supply chain transparency — every test report lists the issuing lab, the product tested, and whether the report is ours or from our authorized co-production partner
For projects requiring Hongyang-branded NB-certified testing beyond this, we can commission it on request. Cost and lead time depend on scope — we’ll quote both openly.
The takeaway
A CE mark on a passive HVAC diffuser does not make the product safer, better, or more European-compliant. More often, it means the supplier misunderstood the regulation. What actually protects your project is the right combination of reaction-to-fire classification, accredited test reports, and a supplier who can speak to the framework instead of around it.
If you’ve been handed a “CE certificate” for a diffuser and want a second opinion on what it actually says — or you’d like our compliance documentation pack for your project — we’re glad to help.
Further reading → Fire Classification for HVAC Diffusers in Europe: What CE Doesn’t Tell You ([https://hongyanghvac.net/hvac-diffuser-fire-classification-europe/])— the long-form companion to this post, covering EN 13501-1 in depth and how to read a Chinese GB 8624 report.