A recirculating ventilation system reuses air from the range after filtering to ensure that reintroduced air is clean. Because the system uses air that is already cooled or heated, these systems require less energy to function. Recirculating systems can be set up to remove humidity from the range. Heating and mechanical cooling systems are available.
Related Tag: ventilation
A purge system draws air from the atmosphere, introduces it into the range, filters the air, and then releases cleaned air back into the atmosphere. Purge systems use prefilters that are changed monthly and HEPA filters that are changed every 2,400 hours.