You only need one filter per ecoflow. One vent is intake and the other vent shoots air out. If you are looking at the front of the ecoflow (with the display panel). The filter should be installed of the left side.
Ecoflow EF3 Pro Delta 1300 Portable Power Station This item is in great condition without cables or accessories as shown. Manufacturer: Ecoflow. Model: EF3 Pro. Part Number: Delta 1300. MPN: Delta 1300.
