A structure includes a fin having first end and second ends and a substantially intrinsic portion between the first and second ends. The vapor temperature is used to adjust the extracting rate of the treatment room by control of a damper connected to an outlet of the treatment room. The apparatus also includes the capability of withdrawing and inserting an imager without the operator having to perform a separate alignment step. The secondary i-node contains non-initialized data blocks, and the primary i-node contains valid and initialized data blocks. If the pressure in the filter chamber exceeds the pressure head in the drain line, a siphoning action will be automatically triggered that evacuates the washing fluid from the filter chamber.