Window sizes are specified by the width first and then the height. The format of the callout is 6036. which translates to 6 foot 0 inches wide by three foot, six inches high. For all non wood windows, the opening in the wall should equal the window call out size, 72 x 42 inches in our example.
Milgard is our primary supplier for windows. They provide a large selection of style, frame material and glazing options including aluminum, fiberglass and composite wood/fiberglass frames.
Our recommended skylight manufacturer is Velux. They produce a variety of styles, fixed and operable, with or without internal shading and a selection of glazing options including snow load rated assemblies.