So we got a larger order for 68 pcs. of about 44 feet banners that need to be welded on both edges. We got a Leister Uniplan E for the job but how afraid should we be of the eventual gases etc. that comes from the banners when welding? I know if you burn it you get nasty stuff but we work in a larger industrial building with high roofs and a large door we plan to open when welding. I've tested the welder and it runs fine at around 530 F but is this too much/little? Now it doesn't smell much and no smoke. With higher temps it smokes so I think it's about right for the material, but I don't want to get seriously ill just for a couple banners... Thank you for any input!