There are primarily two types of SARs: continuous flow and demand flow. Continuous flow SARs constantly supply air to the user, ensuring a steady supply without reliance on the user's breathing pattern. Demand flow SARs, on the other hand, deliver air only when the user inhales, conserving air supply but requiring a tighter facepiece seal. Both types are effective in different scenarios, and the choice between them depends on the specific requirements of the work environment and the safety standards that need to be met.
