Does the door come prehung in its frame?

Yes. It ships prehung in a 4-9/16-inch vinyl frame with brickmould attached, so it installs as one unit into a standard wall opening.

What does left-hand inswing mean?

The hinges are on the left when viewed from outside, and the door swings inward. Check your opening before ordering; the handing cannot be reversed.

What is low-E glass and why does it matter?

Low-E is a thin coating on the glass that reflects heat and UV while letting light through. It reduces solar gain and fading on floors and furniture near the door.

Is the door finished or does it need paint?

It is white primed, not top-coated. Paint it soon after installation to seal the surface and protect the fiberglass and frame.

Will a 36 by 80 door fit my opening?

That is the slab size. The frame adds roughly an inch or more on each side, so the rough opening needs to be wider and taller than 36 by 80. Measure before ordering.

How does fiberglass compare with a steel entry door?

Fiberglass will not rust or dent like steel and handles moisture well. Steel is usually heavier and can be cheaper, but it dents and can rust where the finish breaks.