Select Standard Model

Please select from the choices below, the approximate structure of the model.

one recycle with no purge One recycle - no purge
one recycle with purge One recycle - with purge
two recycles with no purge Two recycles - no purges
two recycles with first having a purge Two recycles - first has purge
two recycles with second having a purge Two recycles - second has purge
two recycles with two purges Two recycles - both have purges