An update to my continued contrarian way... I've painted the galvanized pieces (3 coats, inside and out) with some space age, high-temperature paint. It's used on re-entry vehicles. :-)
http://www.vhtpaint.com/products/flameproof/ There's a curing process involved; 30 minutes @ 250F, 30 minute cool off, 30 minutes @ 450F, 30 minute cool off, and finally, 30 minutes @ 600F. I've completed the first two heats. My oven only goes to 550F. (Kinda like my amp only goes to 11/2, not 12/2.) Tomorrow morning I'll turn on the broiler, move the oven rack to the top and bake everything again for 30 minutes. I don't want to blow up my kitchen at night. The first two bakes stunk it up. So yes, my cheapitude has lead to new experiences. I've researched the galvanized/zinc flu warning and concluded that A4 exhaust temperatures are below what's needed to create zinc oxide fumes. (That's a welding/cutting thing.) Besides, in this case the zinc will be sealed by coats of high-temp paint. So, I'm going forward with my cheapo exhaust riser replacement and will report back at 5 year intervals. Bob M Ox 33-1 Jax, FL
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