I used to place a fan behind me while casting to blow the fume out of my small shop(10' x 12'). This definitely caused a problem in the winter because I didn't want to freeze lol. So I finally got around to putting in a power vent for my cast pot. The down pipe is removable when not in use and the metal panel covering the fan is screwed in so if or when the fan goes out it can easily be replaced. Worked great even when fluxing the pot with pine saw dust. Winter casting to commence