This is the patented push-button version of the Super Simplex commercial grade attic stairs (sometimes called a folding ladder). Available in fully automatic (Model S4000 series - push a button to open/close the door panel and fold/unfold the sections) for ceiling heights up to 13' 6". Ceiling heights up to 16' can be accommodated on the semi-automatic Model S3000 series. On these models, the door panel will open/close at the push of a button and the user then manually unfolds/folds the sections. Meets or exceeds the design requirements of ANSI A14.9.