Compare the Tested Configuration
Performance values change with size, style and glass
Do not assume every product carrying the same family name has identical energy, air, water or structural performance. Operating type, dimensions, glass package, grids and combination details can change the tested configuration.
Ask for the data that corresponds to the proposed window—not only a general brochure. For energy comparisons, review U-factor, solar heat gain and visible transmittance for the applicable product and glass package.
For wind-driven rain and exposure, the opening and installation remain part of the system. Manufacturer documentation does not replace accurate measurement, flashing, sealing and suitable exterior finishing.