Window Building Standards: EN vs ASTM vs AS 2047 Compared
Standards & Certification · 2026/10/21 · 16 views
Direct technical comparison of EN 14351, ASTM E330, and Australian AS 2047. Cross-reference wind load calculations, water tightness, and acoustic ratings.
Short answer: Window and door standards are regional rather than global. EN 14351-1 governs CE marking in the European Union, AAMA/WDMA/CSA 101/I.S.2/A440 with ASTM E283 and E331 governs North America, and AS 2047 governs Australia and New Zealand, while NFRC certification supplies the US energy rating.
Key takeaways
- EN 14351-1 makes a Declaration of Performance and CE marking compulsory before a window can be placed on the EU single market.
- AAMA/WDMA/CSA 101/I.S.2/A440 converts test data into a performance class and a design-pressure grade.
- AS 2047 ties every window rating to a calculated site wind pressure, from N1 up to N6, and AS 1288 governs glass safety.
- NFRC certification reports U-factor, solar heat gain, visible transmittance and air leakage on one label.
- A test report names the specimen, laboratory and test date; a certificate alone does not transfer to your project.
Why window and door standards divide along regional lines
Each framework answers a different regulatory question. In the European Union, the Construction Products Regulation harmonises trade: one Declaration of Performance, one CE mark, one set of declared characteristics. In North America, AAMA/WDMA/CSA 101/I.S.2/A440 is a voluntary consensus standard that state and county building codes adopt, and private certification bodies verify products against it. In Australia and New Zealand, the National Construction Code is performance-based, and AS 2047 is the deemed-to-satisfy route tying a product rating to a calculated site wind pressure.
One window can therefore carry three reports and three different headline numbers, because specimen sizes, test pressures and classification rules differ between the schemes. A CE mark records declared performance against a threshold; it is not a ranking. Buyers who compare a CE declaration with an AAMA certified report line by line are usually comparing test conditions, not products.
EN 14351-1 and CE marking: what a Declaration of Performance proves
EN 14351-1 covers factory-made windows and external pedestrian doorsets sold in the EU and EEA. The manufacturer declares characteristics measured to dedicated methods: air permeability to EN 1026, watertightness to EN 1027, resistance to wind load to EN 12211 and classified under EN 12210, thermal transmittance to EN ISO 10077. The Declaration of Performance and CE mark are then issued under the Construction Products Regulation, with initial type testing by a notified body. CEN and CENELEC publish the underlying test standards.
Energy performance bites hardest. The Passive House Institute sets a window benchmark of 0.8 W/m²K, and manufacturers in that segment must show frame, spacer and glazing values for the installed size. A CE declaration for a product family does not automatically cover a bespoke size, so the extended-application document confirms your schedule sits inside the tested range. Projects targeting that benchmark usually use cold climate passive house window systems.
North America: AAMA/WDMA/CSA 101/I.S.2/A440 with ASTM E283 and E331
The North American route is a single harmonised product standard supported by a family of ASTM test methods. Air leakage is measured to ASTM E283, structural performance to ASTM E330, water penetration to ASTM E331 and cyclic water resistance to ASTM E547. Results place a product in a performance class, running through residential, light commercial, commercial and architectural, and assign a design-pressure grade. That grade is the figure a specifying engineer checks against the calculated wind load.
Hurricane zones add requirements on top. Florida product approval or a Miami-Dade Notice of Acceptance is expected for coastal work, and OPPGATE holds Miami-Dade NOA 26-0311.01 for aluminium fixed windows, alongside its CE, NFRC and AS 1288 certificates. FGIA administers the AAMA certification programme, and ASTM International owns the test methods. A coastal and hurricane rated window system should be specified with both class and grade named in the tender documents.
AS 2047, AS 1288 and the Australian wind-zone system
AS 2047 rates windows and doors against a site-specific wind pressure and expresses the result as an N rating, from N1 for low wind pressure up to N6 for extreme wind pressure. The rating is not free-standing: the engineer calculates site wind pressure from AS/NZS 1170.2 using terrain category, building height and shielding, and the product must carry a rating at or above that pressure. An N rating quoted without that site calculation tells a buyer very little.
AS 1288 sits underneath and governs glass thickness, glazing selection and safety performance; OPPGATE glass is certified to AS 1288. Bushfire-prone sites add radiant-heat testing to AS 1530.8.1. The counter-case matters here: AS 2047 does not set a thermal requirement, so a high N rating says nothing about U-value or solar gain. Thermal performance is specified separately against a project brief or an energy rating tool. Standards Australia publishes both documents.
NFRC certification turns energy performance into a comparable label
NFRC certification is the US energy rating layer. A product is modelled to NFRC 100 for U-factor and NFRC 200 for solar heat gain coefficient and visible transmittance, then the simulation is validated by physical testing at an accredited laboratory. The output is a label carrying four numbers on one basis, so a buyer can compare two suppliers without re-reading their test reports. Code officials and LEED submissions accept that label as evidence.
OPPGATE holds NFRC FWW-M-1 for its 72 series uPVC casement and NFRC GDD-M-10 for its 80 series folding door. The frame geometry behind those values is examined in our guide to thermal break aluminium and energy efficiency. The limitation is geographic: NFRC ratings are not a compliance route in the EU or Australia, where EN 14351-1 and AS 2047 govern instead. NFRC publishes the rating procedures and certified product directory.
Comparison table: the four schemes side by side
The last column is the evidence to attach to any quotation you accept.
| Standard or scheme | Region | What it regulates | Key test methods | Ask the supplier to send |
|---|---|---|---|---|
| EN 14351-1 | EU and EEA | Windows and external doorsets; CE marking | EN 1026 air, EN 1027 water, EN 12211 wind, EN ISO 10077 U-value | DoP, notified body report, extended-application statement |
| AAMA/WDMA/CSA 101/I.S.2/A440 | US and Canada | Performance class and design-pressure grade | ASTM E283 air, E330 structural, E331 water, E547 cyclic | Certified report with class and grade, Miami-Dade NOA for coastal sites |
| AS 2047 | Australia and New Zealand | Structural and water performance against site wind pressure | AS 2047 sequence, AS/NZS 1170.2 wind data, AS 1288 glazing | Report with N rating, AS 1288 certificate, AS 1530.8.1 report for bushfire sites |
| NFRC certification | US energy programmes | U-factor, solar heat gain, visible transmittance, air leakage | NFRC 100 and 200 simulations validated by test | NFRC label for the exact model and glazing make-up |
Two rules apply to every row: the report must reference the profile series, glazing make-up and hardware actually supplied. If a project sits in one jurisdiction, do not pay for three schemes. Our procurement FAQ page covers the rest.
Frequently asked questions
Is a CE mark under EN 14351-1 enough to sell windows into every EU country?
Yes for the single market, because the Construction Products Regulation applies across the EU and EEA. National building regulations can still add energy, fire or acoustic requirements, so check that the Declaration of Performance covers your sizes and glazing.
Which ASTM tests do I need for a Florida project?
Expect ASTM E283 air leakage, E330 structural, E331 water and E547 cyclic water as the base set, plus missile-impact testing for windborne-debris zones. Florida product approval or a Miami-Dade Notice of Acceptance is normally required on site.
Can one window test report cover EN, ASTM and AS 2047 at once?
The schemes differ in specimen size, pressure sequence and classification, so laboratories issue separate reports even for one product family. Some hold accreditation for several schemes and run a combined programme, still producing scheme-specific reports.
What is the difference between an AS 2047 N3 and an N6 rating?
Both sit on one scale of structural and water performance, from N1 for low wind pressure to N6 for extreme wind pressure. N6 indicates testing to a substantially higher design pressure. Neither states thermal performance, and neither is valid until matched to your building's wind pressure.
Do I need NFRC certification for a LEED project?
LEED energy credits are easier to document with NFRC ratings, because the label reports U-factor, solar heat gain and visible transmittance on one basis. Certification is not mandatory, but most energy modellers accept it as default evidence.
What should an aluminium window supplier send with a quotation?
Ask for the test report with class, grade or N rating, the DoP or NFRC label, the extended-application document covering your sizes, the glazing certificate and the hardware schedule. A quotation without report numbers cannot be verified at submittal review.
Send a window schedule, CAD DWG or PDF elevation to karen@oppgates.com and OPPGATE returns a technical quotation within 24 to 48 hours, with lead time of 20 to 30 calendar days after drawing approval. State the destination market and the standard its authority enforces, so the quotation is issued against the right evidence. Intake details sit on the OPPGATE contact page.