What is a primary tool used in demolition tasks?

In demolition tasks, a carpet knife is a primary tool because it is specifically designed for cutting through various materials, including carpet, padding, and other types of flooring or potential building materials. Its sharp blade can efficiently slice through layers of material, making it ideal for removing old carpets during a demolition or cleanup effort.

While other tools listed may have their place in specific applications, they do not serve the direct purpose of facilitating the demolition process. For instance, a pressure sprayer is generally used for cleaning surfaces rather than for cutting or removing materials. An air scrubber is employed to clean air contaminants, not for physical demolition tasks. A biohazard box is intended for the safe disposal of hazardous materials, but it does not aid in the physical process of demolition itself. Thus, the carpet knife stands out as the most appropriate tool for the tasks associated with demolition.