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Heat tunnels in this category have openings larger than 10 inches. Heat tunnels or shrink tunnels heat air around a package that is wrapped in shrink film. The heat causes the shrink film to form a tight seal around the product. Heat tunnels are usually designed with a conveyor belt to carry the product through the tunnel. Each tunnel has adjustable temperature controls. Shrink tunnels are useful for making multi-packs, as well as heat shrinking tamper evident bands on products. Heat or shrink tunnels with openings larger than 10 inches are great for shrink wrapping pallets of product and large boxes.