Last updated: November 2, 2026

Windows & Fenestration · Last updated: 2 November 2026 · Jusen Doors Technical Team · Reviewed by Jusen Doors Engineering Team

AAMA Air, Water & Structural Tests: Performance Grades

Performance Class sets the duty level

The standard uses classes commonly described as R, LC, CW and AW, moving from residential toward architectural/commercial duty. Class is not a marketing synonym for frame thickness. Gateway performance and optional requirements vary, and the product must pass at the size and configuration covered by its evidence. A coastal high-rise sliding door and a low-rise fixed window should not be bought from one vague claim of 'AAMA tested'.

Design pressure, PG and structural pressure

Design Pressure (DP) is the positive/negative wind-load rating associated with the product. Performance Grade is linked to that design pressure and the gateway tests. Structural test pressure is applied above design pressure to demonstrate a safety margin. Engineers derive required pressures from the building code, height, exposure, location on the facade and component/cladding wind provisions. A factory cannot select the project DP from a city name alone.

Water and air tests are system tests

Water-penetration resistance depends on drainage paths, gaskets, sill design, joints and installation perimeter. Air leakage depends on sash compression, hardware and frame tolerances. A strong extrusion cannot pass a leaking corner joint. Test reports should identify specimen dimensions, operator type, reinforcement, glass, hardware, installation/substrate in the lab buck and any failures or retests.

Size is not a detail

Wind deflection and hardware loads grow rapidly as sash size increases. The tested size and area limits in a certification listing matter as much as the pressure number. Changing from a fixed panel to an operable sash, increasing height or removing a mullion can leave the evidence envelope. Mullion and transom assemblies need their own structural logic rather than borrowing a single-window report.

Write a testable specification

• Governing NAFS edition and product Performance Class.
• Required positive/negative DP by facade zone.
• Target PG and maximum project unit size.
• Water-penetration and air-leakage criteria.
• Certification/laboratory report identifying specimen and options.
• Field water/air testing responsibility after installation.
• Anchorage and perimeter substrate excluded from the lab result.

Specification checklist: what to confirm before ordering

• Destination code, climate/wind exposure and compliance route fixed before product selection.
• Operator type, maximum size, frame system and glass build-up matched to test evidence.
• Structural, water, air, thermal and safety-glazing duties specified separately.
• Labels, calculations and submittal documents required at permit/inspection.
• Anchorage, flashing and perimeter sealing responsibilities assigned.

Related guides

• NFRC Ratings for Windows & Doors: How to Read the Label
• Powder Coat vs Anodized vs PVDF for Aluminium Doors
• NZS 4223.3 Safety Glazing: Where Safety Glass Is Required (NZ)

FAQs

Is PG50 suitable for every coastal building?

No. Required pressure depends on the building, location and facade zone, and the tested size must cover the project unit. An engineer sets the requirement.

Does passing an AAMA water test mean my installed window cannot leak?

No. Installation flashing, perimeter seals and wall interfaces are separate. Lab performance is necessary evidence, not a field guarantee.

What is the difference between DP and PG?

DP is the design pressure rating; PG is the performance grade framework tied to that pressure and associated gateway requirements in the standard.

Data note: Figures described as typical, common or planning ranges are industry budgeting ranges with the stated assumptions. Building-code duties, tested scope and final quotations depend on destination, selected construction and order schedule.