For most commercially available fenestration systems, test reports outlining the performance attributes of the system—verified through laboratory testing—are available from the manufacturer.

Stainless steel is commonly used to provide architectural metal fabrications that are corrosion resistant without the need for paint or other coatings.

During verification testing, while water leakage was eliminated at the head of the system, water leakage (originally masked by the extent of water leakage during initial testing) occurred at the sill of the system.