NAFS – 08

North American Fenestration Standard (NAFS), often referred to as a Harmonised Standard comes into effect for Windows and Doors installed from December 20th 2013 in British Columbia.Windows and doors must be tested and rated for conformance to NAFS 08 and the Canadian Supplement to meet the 2012 BC Building Code for all new construction and renovations that require a permit.

Vinyltek is NAFS-08 Ready

Vinyltek has long since produced some of the top rated windows and doors in the industry. So it’s no wonder we consistently find ourselves a step ahead of the game when it comes to meeting some of the most demanding fenestration standards around – including NAFS. Vinyltek is NAFS-08 ready.

More on NAFS

NAFS is an improved method of classifying the type, class and performance of Windows and Doors over previous standards, greater product testing is needed to achieve these standards so all manufactures are required to re-test their products to show they comply. Unlike past standards NAFS does not have a single minimum rating but is tied to geographic location and conditions, it also provides a standardised methodology for rating the entire mulled assembly with the overall performance only being as high as the weakest part of the assembly. NAFS levels the playing field when comparing products forcing everyone up to meet the same standards. The classifications are Performance Class, Performance Grade and Gateway Performance.

Performance Class

There are four Performance Classes:

R: Light duty, commonly used in single-family dwellings. (Part 9 Buildings) – Minimum requirement.
LC: Medium duty, commonly used in low-rise and mid-rise multifamily dwellings. (Part 9 Buildings)
CW: Heavy duty, commonly used in low to mid-rise multifamily dwellings where limits on deflections are imposed and tougher environmental constraints exist. (Part 9 Buildings)
AW: Severe duty, used in high-rises or when extreme use of fenestration is expected. (Part 5 Buildings)

Performance Grade

The Performance Grade is a single numeric designation based on Design Pressure (DP) but representing a number of performance attributes:

  • Uniform load tests (DP)
  • Air and Water penetration resistance
  • Operability
  • Forced Entry
  • Fabrication Quality
  • Stiffness and stress tests
  • Hardware load tests
  • Other tests, such as durability and life-cycle test

The Performance Grade is determined by geographic location, building height, terrain conditions and serviceability. The following link will help you determine your Performance Grade needs:

Gateway Requirements

Each Performance Class (R, LC, CW and AW) has a defined “gateway” set of requirements, these are the minimum test sizes and pressures that each product must meet to qualify for a Performance Class.


For every Window, Door or combination that has been tested to meet NAFS the manufacturer must affix one temporary NAFS label showing the Class and size of window tested and the rating for the lowest rated window in the combination. In addition a permanent label identifying compliance to the NAFS code needs to be applied to the window or door.

Need more information on NAFS?

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