Shrink Tech 4FT Shrink Tunnels have plenty of features that make it a great shrink tunnel system. It is capable of accommodating an endless amount of product configurations. Read more below to learn about the features and options of this impressive machine. Standard features of the Shrink Tech 4FT Shrunk Tunnels include a variable speed conveyor, cogged drive timing belt, top, and bottom calrod heaters and dual-speed fans, and more. Read more below to learn about the features and options of this impressive machine.