Which system requires air to be moved at a low speed to maintain efficiency?

The dry filters system is designed to allow air to be moved at low speeds to maintain its efficiency. When air is moved slowly through dry filters, it provides a better opportunity for particulates and contaminants to be captured effectively. This slow movement ensures that the air has enough residence time within the filter, allowing it to interact with the filter media and trap more particles.

In comparison, higher speeds can lead to turbulence and reduced filtration efficiency, as air may not have sufficient time to pass through and be properly cleaned by the filter. Thus, the characteristic of a dry filters system is best reflected in its need for low air movement speed to ensure optimal performance and maintain air quality.