Performance

What is NAFS?

The North American Fenestration Standard (NAFS) is designed to combine the window and door testing and ratings process into a harmonized North American Standard. It has been incorporated into the National Building Code of Canada and implemented across Canadian provinces.

NAFS Certification requires stringent standards be met for:

  • Air tightness
  • Water penetration resistance
  • Structural performance under wind loads
  • Forced entry resistance

Download Performance Ratings

Every Thermoproof product is NAFS tested and certified. Each product is clearly labelled, outlining the PG value and any specific ratings such as water and air resistance values.

Thermoproof Windows and Doors are manufactured on Vancouver Island and engineered specifically for BC’s coastal climate.

PG Performance Grade and Class. R-Residential. LC-Light Commercial. CW-Commercial Window.

DP Ability to withstand Wind Pressure.

WP Ability to withstand Water Pressure.

A3 Type of air leakage test performed. All Thermoproof windows and doors test to the highest A3 standard.

U-FACTOR Insulating character of the window. Lower is better.

SHGC Solar Heat Gain. Fraction of solar radiation allowed into your home. Lower is better.

STC Sound Transmission. Ability to reduce noise against a wide range of frequencies. Higher is better.