North American Fenestration Ratings: NAFS, NFRC and Project-Specific Evidence

1. Freeze jurisdiction, code, specification and edition before comparing labels

Record country, state/province, municipality, building use, permit date, adopted building and energy codes, local amendments, project specification and authority having jurisdiction. Standards are incorporated through codes, regulations or contracts; publication of a new edition does not make it the governing edition everywhere. FGIA announced AAMA/WDMA/CSA 101/I.S.2/A440-26 (NAFS-26) in June 2026 and stated that it supersedes the 2022 publication as the publishers' current edition. That does not prove adoption for an existing project.

Identify the exact NAFS edition and any Canadian Supplement or US code provisions required by the project. Obtain the licensed standards rather than designing from summaries. Separately identify energy-code path, NFRC programme requirements, ENERGY STAR criteria if contractually required, and local product-approval/high-wind or other regimes. Keep each obligation in its own row.

Resolve conflicts through the authorised designer/code route. Do not let a supplier select the easiest edition, and do not silently upgrade editions when the code cites an earlier one; transition may affect test methods, designators, product scope and documentation.

2. Read NAFS evidence as product-performance evidence

NAFS is the joint North American standard/specification for windows, doors and skylights published by FGIA, WDMA and CSA Group. It establishes product types, performance classes/grades, gateway and optional requirements and test methods within its scope. A designation must be read in full with product type, class, performance grade, size and secondary designator information required by the governing edition; ‘commercial grade’ or a pressure number detached from the tested specimen is not a reviewable claim.

Request the laboratory report and certification/label evidence required by the project. Confirm specimen dimensions, operator type, frame and sash, glass, reinforcement, mullions, hardware, weatherseals, drainage, anchorage/test buck and deviations. Air leakage, water penetration, uniform load/structural and operating requirements have defined conditions; a performance grade is not a direct project wind-load calculation or proof of installed perimeter performance.

If an AAMA/FGIA certification label is claimed, verify manufacturer, code, product, plant where shown, operator type, performance class/grade and current status in the official Certified Products Directory. FGIA states that applying its certification label is the manufacturer's certification that the labelled product meets programme requirements. A bare NAFS test report and participation in a certification programme are not interchangeable states.

3. Read NFRC evidence as certified energy-rating evidence

NFRC operates rating, certification and labelling programmes for fenestration energy performance. Its label and Certified Products Directory provide values such as U-factor, solar heat gain coefficient and visible transmittance within the certified product line and option matrix. NFRC itself does not select the project's energy target or declare a product good, bad or suitable for a climate; the code, specification or another programme supplies acceptance criteria.

Verify the certified product ID, manufacturer and product line in the current NFRC directory, then reconcile product type, frame, glazing layers/coatings/gas, spacer, grids, size or model grouping and other options to the order and label certificate. Do not compare centre-of-glass values with whole-product NFRC values or transfer a rating from one glazing option, frame family or operating type to another.

Treat the temporary product label, label certificate and directory record as connected but bounded evidence. Save the order-specific label/CPD identity for submittal and site records when required. A screenshot without searchable identity may be stale or borrowed; a directory result does not prove the delivered unit retained the certified configuration.

4. Keep NAFS, NFRC, ENERGY STAR and project engineering separate

Use parallel evidence lanes. NAFS generally addresses product structural/weather and related performance within its scope. NFRC rates energy characteristics under its programme. ENERGY STAR uses NFRC-certified ratings and EPA climate-zone criteria for eligible residential products; EPA explains that NFRC does not set minimum ‘good/bad’ performance, while ENERGY STAR applies efficiency thresholds. None of those programmes automatically proves the other.

Add separate lanes for project structural design, mullions/combination assemblies, safety glazing, egress, accessibility, fall protection, acoustics, fire/smoke, coastal or impact requirements, installation anchorage/perimeter, field testing and Canadian provincial/local provisions. Identify where a licensed engineer, energy professional, laboratory, certification body or AHJ decision is needed.

Reject cross-system shortcuts: an NFRC U-factor does not establish NAFS water resistance; NAFS PG does not supply NFRC U-factor; ENERGY STAR does not approve structural performance; CE evidence is not automatically equivalent to NAFS/NFRC; and a test to a named ASTM method is not necessarily a complete NAFS classification or certification.

5. Build a mark-by-mark evidence and change-control dossier

Group the window schedule only where products share a defensible evidence envelope. For each mark group, record governing jurisdiction and edition; NAFS full designation and supporting report/certification directory identity; NFRC certified product ID and ratings/options; other approval lanes; maximum/minimum sizes or interpolation rules only where the applicable programme allows them; installation interface; and open deviations. Preserve licensed material appropriately while giving reviewers enough traceability to verify conclusions.

Require a deviation analysis for changes to size, aspect ratio, operator, frame, reinforcement, mullion, glass thickness/build-up, spacer, hardware, weatherstrip, drainage, finish-related components, fabrication plant or installation/anchor arrangement. Different programmes may treat a change differently, so route it through both NAFS/certification and NFRC rating owners plus the project designer as applicable. One owner's acceptance does not bind another.

At production and delivery, trace labels and product IDs to opening marks and inspect that the configuration matches the approved schedule. Record absent, damaged or mismatched labels without inventing a field relabelling remedy. Final status should say exactly which evidence lanes are verified and which remain project/AHJ decisions—not ‘North America certified’.

FAQ

Continue the project review

Connect this guide with the proposed window and door systems, then review how Cavorlen approaches manufacturing and quality control. When your schedule is ready, send it through the project review form.

Related buyer guides

• How to Read Window Air, Water and Structural Test Reports for Supplier Technical Review
• How to Write Air, Water and Wind Requirements in a Window Specification
• Whole-Window U-Value vs Centre-of-Glass: How to Compare Thermal Evidence