The wind load resistance of aluminum frames measures the deformation of a frame due to the pressure exerted by the air.
Categories: (lower = worse) A1, A2, …, B2, …, C5, C Exxx (higher = better). The letters A, B, C measure the deflection of the frame, while the numbers 1, 2, …, 5 indicate the category of applied pressure in the testing laboratory. A frame classified in class Exxx indicates the highest value (where xxx is the applied pressure value).
In all the above, the installation of the frame as well as the perimeter mechanisms play a primary role. If the aluminum frame is installed (sealed) differently from the frame tested in the laboratory or has different mechanisms and components, none of the above values apply (see aluminum frame certificates).
The wind load resistance of aluminum frames is one of the key quality indicators of both construction and installation in aluminum frames, and an important factor regarding their performance.
How the wind load resistance of frames is measured
To measure a frame’s wind load resistance, a frame is placed in a certified test chamber, and we gradually begin to apply water and air under pressure to it.
The moment the frame begins to show leaks, the process stops, and the frame is classified into the category of
See actual test
