Added a 3d printed intake to my Falcon2 which helps immensely with airflow through the enclosure to evacuate smoke/particulates while still maintaining negative pressure inside. It’s oriented at the opposite corner from the exhaust fan.
https://www.printables.com/model/1259885-falcon2-pro-enclosure-intake-shroud
Does require you to cut a hole in the drawer which will probably void your warranty. 
Not an issue for me so I went for it and this helps.
Added to collection here: https://www.printables.com/@jurassic73/collections/2056512