What heating system typically does not include air filtration?

Radiant heating systems are typically designed to operate by warming surfaces, such as floors or walls, which then radiate heat into the living space. This method does not involve the movement of air as part of the heating process, which limits the need for air filtration. Unlike convection or hybrid systems that rely on air circulation to distribute heat, and therefore require a filtration component to ensure clean air, radiant systems focus solely on heat transfer through solid surfaces.

Conduction systems may also lack a designated air filtration component because they do not rely on air movement to provide heat. However, radiant systems explicitly define their heating approach by relying on direct heat transfer rather than air, making them clear candidates for systems without air filtration.