When I smelt I flux a pot a couple three times while removing clips, steel and zinc weights and my lead looks good. Do I need to flux once the lead goes into the bottom pour pot or should it be ok? The reason I ask is I cast indoors and as we all know fluxing can make even a well ventilated room smokey for a short time. I do use a fan to push air out the window but its not enough if just a little bit of wax is dropped into the casting pot. I am working on a plan for a vent pipe with fan but I'm wondering if fluxing is really necessary if the work is done during the smelting process.