What characterizes a re-circulation (ductless) kitchen ventilation system?

A re-circulation (ductless) kitchen ventilation system is characterized by its method of air handling. This type of system operates by pulling air from the kitchen environment through a series of filters, which capture grease, odors, and other particles. After the air passes through these filters, it is then released back into the kitchen space. This means that the system does not vent air to the outside but instead recirculates purified air within the kitchen area.

The focus on filtering and recirculating air makes this system particularly suitable for situations where it is impractical or impossible to install ductwork for venting purposes. This allows for improved air quality in the kitchen without the need for external venting, making it a convenient choice for many residential settings, particularly in urban environments or locations with strict building codes regarding venting.

In contrast, other options describe systems that either rely entirely on external air, vent air outside after filtration, or depend on natural ventilation, which do not accurately represent the function of a re-circulation system. Recognizing this distinction is critical for understanding the different types of kitchen ventilation options available and selecting the best one based on the specific kitchen design and requirements.