A polyester production system employing a vertically elongated esterification reactor. Movement of the device in a first direction and a second direction across a surface to be cleaned collects debris removed by the first and second debris collecting elements in the gap. Deposition of the three layers occurs at reduced deposition temperatures which further reduces the stress of the multi-layer film. In still further example embodiments, one or more center layers may be disposed between two feet, with the size of the center layer determining the depth of the door threshold. The seal has at least two areas.