This is a window fan extender panel in black. This part is sold individually and is approved by the manufacturer as an authentic replacement part. If your fan does not fit securely to the left and right of the window casing, open the locking tab by pulling up and out the built-in extender panel. This will help to keep the fan fitted to the window safely. Re-lock or close the tab after the fan is properly in place.
This is a single OEM HEPA filter for an air purifier. It is designed to remove 99 percent of airborne allergens. This is not the type of filter that requires regular replacement, however if it is damaged or has not been properly maintained, it will need to be replaced right away to allow the unit to work properly. If you are experiencing a decrease in airflow, check the condition of the HEPA filter. It should be cleaned every 3-4 months, using a vacuum. Never use household cleaners or water, as they could damage it. To remove the filter, remove the rear grill, and remove the filter. Install the new filter by aligning the arrows on the filter frame accordingly and install the rear grill back on the equipment and latch it back into a secure position.