It is important to note that the V60 / V60 Plus ventilator is designed with three layers of filters: the air inlet filter, the main flow bacteria filter, and a filter on the patient circuit exhalation port. It is suggested that customers follow the instructions in the V60 / V60 Plus ventilator User Manual to filter air for delivery to the patient with the air inlet filter, to always use a main flow bacteria filter on the patient gas outlet port, and recommending use of a filter on the patient circuit exhalation port.