It depends. We would have to know the model number and serial number of the enclosure. If it is a 2000 series EVA that has a remote blower, it depends on the configuration. Upon verification of the model and serial number, we can either do the conversion kit to convert a single HEPA unit to a dual HEPA unit. Or, they would have to connect to house exhaust. Or, they can buy a new fan housing that is dual HEPA. For top mount there is no way to convert a single HEPA to a dual HEPA. So, they can either exhaust out or buy a brand-new unit that is dual HEPA. And, they can use the single HEPA for non-hazardous compounding.