The polyester corrugated curb integrates a Skylux skylight into a corrugated roof of the type 177/51 or 130/30.
The polyester square-round curb allows a round skylight to be mounted on a square roof opening and is the most aesthetically pleasing choice.
If direct zenith light is undesired (e.g. drawing office, lab, etc.), installation of a polyester northern light curb is recommended.