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Torch vs. Chainsaw

This episode turns up the volume when Acoustiblok, a thin noise-reduction material that is as effective as 12 inches of solid concrete, takes on the Nathan Air Chime, a screaming train horn that produces the same decibel levels as a jet airplane. The next showdown sucks – literally – when a PVAC, a vacuum-powered climbing device that allows a person to quickly and safely scale any flat wall or surface, takes on world-champion rock climber Tori Allen in a race to the top of a 90-foot wall.