The Ventstop Ventilation Control Unit

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The Ventstop Ventilation Control Unit (VCU) is designed to provide a safe, cost-effective and robust alternative to conventional ventilation control for underground mining and tunneling.

The Ventstop is fully portable and inflates in minutes using compressed air and a venturi system. It facilitates blocking off horizontal and/or vertical openings to control dust, fumes, smoke and heat. A control box maintains the internal pressure of the unit over an extended period of time.

I see this product as an inflatable barricade.